Take A Dive Into This Amazing Sea Creatures Quiz!
Written by Daniel Rackley
Last updated · 29 min play time
With as deep and vast as the oceans around the world are, there are so many species of sea creatures that naming them would be a full-time job. Take this quiz and see what you know about what lies below the water!
Quiz written by
Daniel RackleySea Creatures Quiz Questions
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Question 1
Which of the following is a defining characteristic of all invertebrates?
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AThey have no backbone
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BThey are warm blooded
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CThey are symmetrical
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DThey are herbivores
They have no backbone
Invertebrates by definition have no backbone.
Question 2
This massive sea creature can measure up to 40 feet long or more. What is the name of this massive creature of the deep that has the largest eye known in the animal kingdom?
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ACuttlefish
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BDumbo Octopus
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CBioluminescent Octopus
-
DGiant Squid
Giant Squid
The giant squid is an animal that can grow up to 40 feet long or more, but not too much is known about these creatures who live in the depths. Most of our knowledge of them comes from when their dead bodies wash up on shore or get caught in fishing nets.
Question 3
Nearly all amphibians undergo a significant change from infancy to adulthood. What is the name of this change?
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AMetamorphosis
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BPuberty
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COsmosis
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DMitosis
Metamorphosis
Nearly all amphibians change from a larval stage, usually as a tadpole in the water, to an adult, usually living a life at least partially on land. The transition between these two phases is known as metamorphosis.
Question 4
The male of one type of fish is the only known creature where the male is the one to become pregnant. What fish is this?
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AHalibut
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BSwordfish
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CWolf eel
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DSeahorse
Seahorse
Female seahorses transfer their eggs to the males making them the only creature where the males become pregnant.
Question 5
This deep sea creature contains features of both octopuses and squids, suggesting that it may be a part of an ancestral line between the two types of creatures. What is the name of this reddish-brown skinned creature?
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ABlue-Ringed Octopus
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BThe Dumbo Octopus
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CSea Angel
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DVampire Squid
Vampire Squid
The vampire squid has blue eyes and a reddish-brown skin color. It contains traits of both octopuses and squid, suggesting that it may be part of a group that comes from a common ancestor of the two groups. Vampire squid have the largest eye size-to-body ratio of any known animal on earth.
Question 6
Which crustacean is known to make its home within the discarded shells of other animals?
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ASoftshell crab
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BHermit crab
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CCrawfish
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DSpider crab
Hermit crab
The hermit crab is known for taking up residence in the discarded shells of snails.
Question 7
Which of the following fish is caught by humans who stick their hands/arms into holes and pull the fish out after the fish bites their hand?
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ACatfish
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BLargemouth Bass
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CSteelhead
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DRainbow trout
Catfish
Noodling, also known as handfishing, is the practice of putting your hand and/or arm into a catfish nest in hopes of one biting you, and then pulling it out of the water.
Question 8
Coral reefs are made up of invertebrate animals known as coral polyps. These are actually transparent animals related to jellyfish. Where do corals reefs get their color?
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AThe algae they feed on
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BFish scales
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CFish droppings
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DThe rocks underneath
The algae they feed on
The brilliant colors coral reefs display come from algae that lives on them and that they ingest. The algae and the coral have what is known as a symbiotic relationship.
Question 9
How are tree frogs able to climb trees?
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ASticky mucus on their feet
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BExtreme gripping strength
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CSmall claws
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DMolecular bonds
Sticky mucus on their feet
Tree frogs have pads that produce a mucus that adheres to trees and other objects.
Question 10
What is the name of the colorful small snail that is pink and orange with black circles?
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ACommon Periwinkle
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BGarden Snail
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CChristmas Tree Worm
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DFlamingo Tongue Snail
Flamingo Tongue Snail
The flamingo tongue snail can be found in tropical to temperate climates of the Western Atlantic Ocean. This creature is a small snail whose bright and colorful patterns serve as a warning that it is poisonous.
Question 11
Closely related to the seahorse, what is the name of the creature that has many plant-like appendages over its entire body that help with camouflage?
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AClown Fish
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BFlamingo Tongue Snail
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CLeafy Seadragon
-
DPink See-Through Fantasia
Leafy Seadragon
The leafy seadragon has a number of leaf-shaped appendages that cover its body that help it to blend in with the seaweed and kelp formations where they live. Like seahorses, the male leafy seadragon is responsible for childbearing.
Question 12
Which of the following is NOT a fish commonly known to live in and around coral reefs?
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AYellow tang
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BClownfish
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CPiranha
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DParrotfish
Piranha
Yellow tangs, parrotfish, and clownfish are all commonly found on coral reefs, but piranhas are found in the rivers of South America.
Question 13
How do most amphibians reproduce?
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ABy self cloning
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BBy live birth
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CBy laying eggs
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DBy spreading spores
By laying eggs
Almost all amphibians lay eggs when reproducing.
Question 14
This deep sea animal looks like a plant, but is actually an animal. What is the name of this creature that waits for food to drift into its outstretched poisonous tentacles which then close around the victim until it is digested?
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ABlobfish
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BFlamingo Tongue Snail
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CVenus Flytrap Sea Anemone
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DChristmas Tree Worm
Venus Flytrap Sea Anemone
The Venus flytrap sea anemone feeds in a similar way to its on land namesake, even though the sea anemone is an animal, where the Venus flytrap on land is a plant. It faces into the water current and waits for its prey to touch one of its poisonous outstretched tentacles. Once the animal touches the tentacle, the other tentacles close in around the prey where it is digested.
Question 15
Male Darwin frogs are responsible for rearing the young from eggs to tadpoles and through metamorphosis until they are frogs. What is the unique way in which they rear their young?
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AThey swallow them
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BThey sing to them
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CThey constantly spit on them to keep them wet
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DThey sit on them
They swallow them
Male Darwin frogs swallow their eggs a few days before they become tadpoles and store them in their vocal sac until they become full frogs. They then spit them out to live their life.
Question 16
Slugs, worms and many other invertebrates are hermaphrodites. What does it mean for an animal to be a hermaphrodite?
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AThey eat plants and bugs only
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BThey mate year round
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CThey move without the use of any limbs
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DThey have both male and female organs
They have both male and female organs
Hermaphrodite creatures are creatures that have both male and female reproductive organs.
Question 17
The animal commonly considered to be the most toxic in the world is an invertebrate killing humans in minutes or less. What is the most toxic animal in the world?
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AThe box jellyfish
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BThe king cobra
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CThe blue ring octopus
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DThe cone snail
The box jellyfish
The box jellyfish is often considered the most toxic animal in the world. Small but deadly, it can kill humans in minutes causing shock, heart attacks and/or drowning.
Question 18
Many fish are able to create light that they use in various ways. What is it that makes them able to generate light in most cases?
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ABioluminescence
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BInfrared scales
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CThermal radiation
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DStatic electricity
Bioluminescence
Many fish use a chemical reaction that generates light known as bioluminescence. They use bioluminescence for a variety of purposes including hunting and escaping predators.
Question 19
Which of the following terms applies to the relationship between a whale and round worms that live in it's gut?
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AParasitism
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BCommensalism
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CMutualism
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DPredation
Parasitism
In parasitism one member of the interacting pair benefits and the other member is harmed but not, at least not immediately, killed. Another example are the bacteria that promote tooth decay.
Question 20
What is commonly considered the most poisonous fish in the ocean due to its spines?
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AGreat white shark
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BLionfish
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CStonefish
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DPufferfish
Stonefish
The stonefish is considered the most poisonous fish in the ocean. Looking like a rock, it is often stepped on causing extreme pain and at times death if the antivenom is not available.
Question 21
This long and monstrous deep sea creature has so many teeth, that when its mouth is fully closed, many of its teeth are still fully visible. What is the name of this animal whose snout sticks out well past its mouth?
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AHammerhead Shark
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BWhale Shark
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CBottlenose Dolphin
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DGoblin Shark
Goblin Shark
The goblin shark is a long creature that has so many teeth, they are visible even when its mouth is closed. It can sense the electric fields created by other fish which helps them hunt prey.
Question 22
This ocean creature is primarily found around the islands of Hawaii. What is the name of this small creature with a pale yellow translucent body?
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AChristmas Tree Worm
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BSea Cucumber
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CFlamingo Tongue Snail
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DGolden Lace Nudibranch
Golden Lace Nudibranch
The Golden Lace Nudibranch is a small creature, usually between 1 and 2 inches (5 cm) in length, that is found primarily around the islands of Hawaii. It has a translucent yellow body with a network of yellow-orange lines webbing throughout its body.
Question 23
What is the name of this bottom-dwelling fish that is found primarily around the Galapagos Islands, and uses its fins like legs for walking?
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ASea Angel
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BRed-lipped Batfish
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CBlack Swallower
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DHorseshoe Crab
Red-lipped Batfish
Found primarily around the Galapagos Islands, the Red-lipped Batfish spends its time on the ocean floor or around reefs in search of food. It has two fins that work more as pseudo-legs to walk around the ocean floor or lean on.
Question 24
Thought to have gone extinct 65 million years ago, what is the name of the fish that was discovered to be alive in 1935?
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ACoelacanth
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BSea Bass
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CVampire Squid
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DAngler Fish
Coelacanth
The coelacanth was thought to be extinct until one was found alive in 1935. Coelacanth's live in very deep waters and are estimated to live to 60 years of age or more.
Question 25
What is a group of toads called?
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ASchool
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BGaggle
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CColony
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DKnot
Knot
A group of toads is commonly known as a knot.
Question 26
Voted world's ugliest animal in 2013, what is the name of the creature with a fat head and large mouth, that is meant to live at depths below 2,000 ft (600 m), but looks very different on the surface?
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ABlobfish
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BAngler Fish
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CCatfish
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DRed-lipped Batfish
Blobfish
The blobfish was voted world's ugliest animal in 2013 due to its blob-like appearance. However, the creature isn't supposed to look like it does, because it normally lives 2,000 feet (600 m) below the surface where the pressure is much more extreme. The pressure change from bringing it to the surface has caused its body to disfigure in the way we generally see it.
Question 27
Which of the following is NOT a defense mechanism of the pufferfish?
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APointy spines
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BShort burst of speed
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CPoison
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DElectric shock
Electric shock
Pufferfish defend themselves with sharp spines that protrude when they "inflate" themselves. This method of defense is only used when their short burst of speed fails to take them to safety. These tactics combined with their poison make them difficult prey.
Question 28
Which of the following describes an intertidal environment?
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ASea floor
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BFlood at high tide and exposed at low tide
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CFreshwater meets land.
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DOpen ocean
Flood at high tide and exposed at low tide
Intertidal regions are flooded at high tide and exposed at low tide. These are fun areas where you can explore tidal pools.
Question 29
What fish, born with eyes on both sides of its head, has one eye migrate to the other side of the head, giving it both eyes on one side of its head?
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ASardine
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BFlounder
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CYellow tang
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DStingray
Flounder
The flounder, like other flat fish start out as relatively normal looking fish, but over time one eye will slowly move to the opposite side, and as it does so it also changes into a flat fish, extremely good at hiding on the ocean floor.
Question 30
What is the largest bony fish?
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AOcean sunfish
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BGreat white shark
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CWhale shark
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DBarracuda
Ocean sunfish
The ocean sunfish, also known as the mola mola is the largest of all bony fish (all fish except sharks and rays).
Question 31
What determines the body temperature of most fish?
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AThe temperature of the water
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BThe amount and speed of their swimming
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CWhat they eat
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DThermoregulation (like humans)
The temperature of the water
As cold-blooded animals, the body temperature of fish is determined by their environment, therefore it is determined by the temperature of the water they are in for nearly all fish. Some sharks however can use swimming to elevate their core temperature to slightly above that of the water.
Question 32
What is the name of the endangered fish that can grow to be over 6 feet long, and has a prominent bulge on its forehead?
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AAngler Fish
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BHumphead Wrasse
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COcean Sunfish
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DBlack Swallower
Humphead Wrasse
The humphead wrasse, otherwise known as the Napoleon wrasse or Maori wrasse, is an endangered fish that can grow up to 6 feet long. They spend most of their time swimming through coral reefs looking for hard shelled prey such as mollusks, starfish, or crustaceans.
Question 33
Which invertebrate is known to have a stomach that can exit the body while eating and then reenter the body when feeding is done?
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ASea Urchin
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BOctopus
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CStarfish
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DJellyfish
Starfish
Starfish have the unique ability to consume prey that are entirely outside of their body by having a stomach that can exit the body.
Question 34
What is the primary purpose of a frog croak?
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ATo attract insects that they then eat
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BTo attract a mate
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CThey sing to their young as part of parenting
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DTo scare away predators
To attract a mate
Only male frogs vocalize, and they do so to attract female mates.
Question 35
Almost 90% of all amphibian species are part of which order?
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ACaecilians
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BNewts
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CFrogs and Toads
-
DSalamanders
Frogs and Toads
About 6800 of the 7700 amphibian species are frogs or toads.
Question 36
What is the name of the deep sea fish that has a luminous lure for prey that dangles from its forehead?
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AVampire Squid
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BAngler Fish
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CDogfish
-
DBlack Swallower
Angler Fish
Anglerfish live in the dark depths of the ocean and have a piece of their body that hangs in front of their mouth with a luminous tip that acts as a lure for prey. Anglerfish have such big mouths that they are able to swallow prey that is up to twice their size.
Question 37
Fresh water and seawater mix in _____.
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Aan estuary
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Bthe littoral zone
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Cthe benthic zone
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Dthe pelagic zone
an estuary
By definition, estuaries are the places where fresh and marine water mix. The resultant mix of water is referred to as brackish.
Question 38
What is the most consumed fish in the United States?
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ATuna
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BCod
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CSalmon
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DTrout
Tuna
The most consumed fish in the U.S. is tuna, primarily in the form of canned tuna. Worldwide, herring is the most consumed fish. Keep in mind this excludes shellfish such as shrimp, which aren't actually fish.
Question 39
In the absence of tiger sharks, sea turtles may deplete an area of sea grass. The loss of sea grass leads to the loss of other species that are dependent on the grass. Therefore, tiger shark predation on sea turtles maintains the diversity of the sea grass community. In this context, the tiger sharks are considered _____.
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Aprey
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Bkeystone species
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Ccommensalists
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Dparasites
keystone species
A keystone is the essential part that holds a structure (such as an arch) together. Remove the keystone species and the nature of the community will change.
Question 40
Octopuses can squeeze their bodies into incredibly small spaces, what is the primary limiting factor in determining how small a space they can fit through?
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ATheir will power
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BTheir beak
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CTheir largest suction cup
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DTheir brain
Their beak
With the beak being the only hard part on the body of an octopus it is the only thing that limits the space they can squeeze through.
Question 41
What is the name of this ocean worm that comes in a variety of bright colors, is largely sedentary, and has two crowns protruding from its tube-shaped body?
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ABearded Fireworm
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BPeanut Worm
-
CChristmas Tree Worm
-
DEarthworm
Christmas Tree Worm
Christmas Tree Worms have two brightly colored crowns that stick out from its body and look similar to Christmas trees. They use these crowns to catch phytoplankton for their food.
Question 42
Which of these organisms are ultimately responsible for making energy available to the other organisms listed here?
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ASharks
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BWhales
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CZooplankton
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DPhytoplankton
Phytoplankton
"Phyto-" as in "light" and in "photosynthesis". Phytoplankton are the photosynthesizers at base of the aquatic food web.
Question 43
This creature is one of the smallest and deepest living octopods in the ocean. What is the name of this animal that has a set of ear-like fins?
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ABlue-ringed Octopus
-
BDumbo Octopus
-
CCuttlefish
-
DArgonaut
Dumbo Octopus
The dumbo octopus has an average size between 20-30 cm, and has been found at depths between 400-4,800 meters (1,300 - 15,750 feet) beneath the surface. They each have a set of ear-like fins on top of their head that they use to propel and steer themselves through the water.
Question 44
The males of one species of fish is a parasite of the females. They will bite onto a female slowly fussing their bodies, joining her blood stream and dissolving all of his internal organs except the testes. What deep sea fish is this?
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APiranha
-
BCarp
-
CAnglerfish
-
DHaddock
Anglerfish
The male anglerfish does all of these things. They are much smaller than the females and do not have the light that lures prey that the females have.
Question 45
In general, which of these biomes produces organic matter (incorporates energy) at the lowest rate?
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AOpen oceans
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BTemperate forests
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CTemperate grasslands
-
DEstuaries
Open oceans
Much of the open ocean, with the exception of upwellings, are where nutrient-rich water is brought up from the depths, is nutrient poor and thus produce organic matter at a rate that is on par with that of deserts.
Question 46
In an aquatic ecosystem, what name is given to the region where photosynthesis can occur?
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APhotic zone
-
BThermocline
-
CBenthic zone
-
DPelagic zone (open ocean)
Photic zone
Photic referring to (sun)light, a requirement for photosynthesis.
Question 47
Coming in at around 55 pounds and up to 5 feet long, what is the largest known amphibian?
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AThe goliath toad
-
BThe Japanese giant salamander
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CThe African toad
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DThe deep sea newt
The Japanese giant salamander
The Japanese giant salamander is the largest known amphibian in the world.
Question 48
Where do amphibians typically lay their eggs?
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AIn the water
-
BOn leaves or plants
-
CIn nests on land
-
DIn the sand or dirt
In the water
Amphibians usually need to lay their eggs in water, because if they dry out the eggs will die and never hatch.
Question 49
What is the main difference between the shark and ray class of fish and all other types of fish?
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ASharks and rays have multiple layers of teeth
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BSharks and rays are much more aggressive hunters.
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CSharks and rays have skeletons that are made of cartilage
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DSharks and rays have a tall dorsal fin
Sharks and rays have skeletons that are made of cartilage
The main differentiation is the skeleton. Sharks and rays have skeletons made of cartilage while other fish have skeletons made of bone.
Question 50
Poison dart frogs often have very brightly colored skin. What do scientists believe is the main purpose of this coloring?
-
AFor males to attract female mates
-
BCamouflage
-
CTo warn predators they are poisonous
-
DTo better absorb heat from the sun
To warn predators they are poisonous
The bright colors and patterns warn potential predators that they are poisonous.
Question 51
This long thin creature can puff itself up or shrink itself down. What is the name of this deep sea creature that can open its mouth so wide it can swallow creatures of its own size?
-
ALeafy Seadragon
-
BGoblin Shark
-
CGulper Eel
-
DFrilled Shark
Gulper Eel
The gulper eel, otherwise known as the pelican eel, is able to open its mouth so far it can swallow prey of its own size. It is also able to puff itself up or shrink itself down. Gulper Eels can be found at depths of 1,640 feet to 1.83 miles (500 m to 3 km).
Question 52
Clownfish have developed an immunity to the poisonous tentacles of what sea creature?
-
ABox jellyfish
-
BSea anemone
-
CHumboldt squid
-
DSea urchin
Sea anemone
Clownfish are immune to the sting of the sea anemone making it a perfect home. The relationship also helps the anemone as the clownfish often lures other fish close enough for the anemone to sting and eat.
Question 53
What is the name of the type of crab whose average leg span is 13 feet (4 meters), has an average weight of 40 pounds (16-20 kg), and can live to be 100 years old?
-
AJapanese Spider Crab
-
BKing Crab
-
CBlue Crab
-
DFiddler Crab
Japanese Spider Crab
The Japanese spider crab is the largest known type of crab, and may also have the longest lifespan of any known crab. However, because their long legs are weak, many Japanese spider crabs are found with missing limbs.
Question 54
All of the following are arachnids EXCEPT one. Which one is NOT an arachnid?
-
AScorpions
-
BTicks
-
CSpiders
-
DCrawdads
Crawdads
Crawdads are crustaceans not arachnids.
Question 55
Which of the following facts about jellyfish is true?
-
AThey have hearts
-
BThey have a nervous system
-
CThey have brains
-
DThey have a respiratory system
They have a nervous system
Jellyfish have a nervous system, but do not have lungs, brains or hearts.
Question 56
What is the name of the creature who lives very deep in the ocean and can devour prey twice its length and up to 10 times its mass?
-
AGulper Eel
-
BBlack Swallower
-
CNapoleon Wrasse
-
DCoelacanth
Black Swallower
The black swallower is a fish that can swallow prey twice its length and up to 10 times its mass. It lives very deep in the ocean - up to 10,000 feet below the surface!
Question 57
A unique invertebrate has eyelids that give the eye a "W" shape. What animal is this?
-
ATarantula
-
BTapeworms
-
CHumboldt squid
-
DCuttlefish
Cuttlefish
The cuttlefish has an amazing eye shaped like a "w".
Question 58
Most amphibians start life in the water as larvae, how do these young amphibians breathe?
-
AThrough drinking water
-
BWith Lungs
-
CWith gills
-
DThey don't need to breath as larvae
With gills
Tadpoles breath underwater using gills.
Question 59
Some small land going frogs and salamanders never develop lungs, even after becoming fully developed. How do these amphibians get oxygen?
-
ATheir stomach
-
BWith gills
-
CTheir skin
-
DTheir feet
Their skin
Lungless amphibians typically have the gas exchange required to survive (breathing) through their skin.
Question 60
Pilot fish are often found accompanying sharks. The shark is unaffected by the pilot fish, the pilot fish eats scraps the shark misses. Which of the following terms applies to the relationship between sharks and pilot fish?
-
APredation
-
BMutualism
-
CParasitism
-
DCommensalism
Commensalism
Commensalism describes a relationship in which one member of the interacting pair benefits and the other is unaffected. Another example is, often, the mites that eat the dead skin that a person sheds.
Question 61
What invertebrate will eject internal organs through their anus in the direction of predators as a defense mechanism?
-
ABanana Slug
-
BGiant Millipede
-
CSea Cucumber
-
DKing Crab
Sea Cucumber
The sea cucumber is known to expel internal organs at predators in order to escape. They are then able to regenerate the missing organs in a matter of days.
Question 62
Which of the following terms applies to the relationship between cleaner shrimp and the fish they clean?
-
AParasitism
-
BPredation
-
CCompetition
-
DMutualism
Mutualism
Mutualism is the term that applies to an interaction between populations in which both populations benefit.
Question 63
Electric eels can generate a surprising amount of electrical power when shocking their prey. About how much power can it generate?
-
A5 Watts
-
B50,000 Watts
-
C50 Watts
-
D500 Watts
500 Watts
Electric eels can generate around 500 volts of charge and have a current of up to 1 amp flow from them to the prey, this means that for that short period of time (usually around 2 milliseconds) they produce 500 Watts of power.
Question 64
Which amphibians are limbless as adults?
-
ACaecilians
-
BToads
-
CNewts
-
DSalamanders
Caecilians
Caecilians are worm-like amphibians that are limbless in adulthood.
Question 65
Swimming at speeds up to 68 mph what is the fastest fish in the world?
-
ANurse shark
-
BSailfish
-
CMarlin
-
DTuna
Sailfish
The sailfish is the fastest fish in the world, followed by the marlin.
Question 66
What is the name of this swimming sea slug that has a luminous glow, translucent skin, and wings that are actually its feet?
-
AVampire Squid
-
BGulper Eel
-
CSea Angel
-
DSea Butterfly
Sea Angel
The sea angel is a small type of swimming sea slug with translucent and luminous skin and wings that are actually its feet. They can be found in polar regions beneath the ice, and they have also been found in equatorial areas.
Question 67
A sperm whale in the middle of the Atlantic Ocean is in which oceanic zone?
-
Aestuarine
-
BBenthic
-
CPelagic
-
DIntertidal
Pelagic
The pelagic zone is the term that refers to the open ocean. This is the region where you may find large oceanic animals such as whales.
Question 68
The benthic zone of an ocean is _____.
-
Awhere marine water encouters land
-
Bthe deep region of a body of water
-
Cis the depth to which sunlight penetrates
-
Dthe open ocean
the deep region of a body of water
The benthic zone is the deep region of a body of water. This is where you will find life such as flatfish, snails, and sponges.
Question 69
In a food chain consisting of phytoplankton, zooplankton, fish, fishermen, sharks, the fishermen are _____.
-
Atertiary consumers
-
Bprimary producers
-
Cprimary consumers
-
Dsecondary consumers
tertiary consumers
The phytoplankton are primary producers. Primary producers are eaten by primary consumers (zooplankton). The primary consumers are eaten by secondary consumers (fish). The secondary consumers are eaten by tertiary consumers (fishermen).
Question 70
Different whale species consume krill. With regard to the consumption of krill, which of the following term describes the relationship among these different whale species?
-
APredation
-
BMutualism
-
CCommensalism
-
DCompetition
Competition
The question describes interspecific competition - competition between members of different species. Intraspecific competition, competition between members of the same species occurs when, for example males compete for the opportunity to mate.
Question 71
What is the name of this prehistoric-looking shark that spends most of its time in deep waters and can grow up to 7 feet (2 m) in length?
-
AGoblin Shark
-
BGreat White Shark
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CFrilled Shark
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DBlack Swallower
Frilled Shark
The frilled shark lives deep in the ocean and has a similar swim-style as that of an eel. These animals are considered to be near-threatened with extinction.
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