Are You Smarter Than A 7th Grader?

The size of a closed fist

The size of your heart can vary depending on your age, size, and the condition of your heart. Some diseases can cause the heart to enlarge.

All of the above

People need blood to survive. Without blood, our organs would not receive nutrients and oxygen, stay warm or cool off, and fight infection. We also need blood to remove the things we don't need from our bodies.

4

The heart has two upper chambers (the right and left atria) and two lower chambers (the right and left ventricles). The right side of your heart pumps oxygen-poor blood to your lungs; the left side receives oxygen-rich blood from the lungs and sends it through the aorta to the rest of your body.

Using thinking and practical skills to understand our world

Science is a process of discovery that allows us to link isolated facts into coherent and comprehensive understandings of the natural world.

Through dead organisms

While some of our human-produced carbon dioxide emissions are absorbed by the ocean and land plants, around half of our carbon dioxide emissions remain in the air. Carbon is found in soil from dead and decaying animals and animal waste.

An arrangement of elements based on atomic number

The Periodic Table arranges all the known elements left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass.

Gas

Air particles vibrate and move freely at high speeds.

Convert food into energy

Mitochondrial division is stimulated by energy demand, so cells with an increased need for energy contain greater numbers of these organelles than cells with lower energy needs.

All of the above

Many animal groups have some species that lay eggs and others that birth live young, including fish, birds, reptiles, amphibians, and even mammals.

Uterus

The fertilized egg stays in the fallopian tube for about 3 to 4 days. But within 24 hours of being fertilized, it starts dividing fast into many cells. It keeps dividing as it moves slowly through the fallopian tube to the uterus. Its next job is to attach to the lining of uterus. This is called implantation.

Taxonomy

Taxonomy is the science of naming, describing and classifying organisms and includes all known plants, animals and microorganisms of the world.

Vaporization

Vaporization is the process of converting a liquid into a gas.

Nucleus

The cell nucleus acts like the brain of the cell. It helps control eating, movement, and reproduction. If it happens in a cell, chances are the nucleus knows about it.

All of the above

Sedimentary rocks are formed from pre-existing rocks or pieces of once-living organisms. They form from deposits that accumulate on the Earth's surface. Sedimentary rocks often have distinctive layering or bedding.

Microscopic

A microscope is an optical instrument consisting of a lens or combination of lenses for making enlarged images of tiny objects.

Atom

Atoms are the basic building blocks of ordinary matter. Atoms can join together to form molecules, which in turn form most of the objects around you.

Habitat

Habitat is the place or environment where a plant or animal naturally or normally lives and grows.

Adaptation

Adaptation, in biology, is a process by which an animal or plant species becomes fitted to its environment.

All of the above

A stimulus is an agent (such as an environmental change) that directly influences the activity of a living organism or one of its parts.

6

Throughout history, humans have developed a number of devices to make work easier. The most notable of these are known as the "six simple machines": the wheel and axle, the lever, the inclined plane, the pulley, the screw, and the wedge.