Which of these was the largest known dinosaur to ever roam the earth?
Answer Argentinosaurus
Fossil evidence of the largest creature to ever roam the earth was discovered in 1987, in (you guessed it) Argentina. Classified, fittingly, as a titanosaur, the Argentinosaurus measured about 120 feet from head to tail and weighed around 100 tons. That's about as heavy as 11 of its T-Rex cousins!
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