dinosaurs

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5 Terms

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What is a dinosaur?

A type of reptile that dominated Earth for over 160 million years, during the Mesozoic Era.

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What are the two main groups of dinosaurs?

Saurischia (lizard-hipped) and Ornithischia (bird-hipped).

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When did the dinosaurs live?

From the late Triassic period (about 230 million years ago) to the end of the Cretaceous period (about 66 million years ago).

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What caused the extinction of the dinosaurs?

A large asteroid impact in the Yucatán Peninsula caused widespread environmental changes that led to their extinction.

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Are there any surviving dinosaurs today?

Yes, birds are considered to be the direct descendants of one line of theropod dinosaurs.