Kahn Academy Natural History Flashcards

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1
Q

Pterosaurs

A

Flying reptiles

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2
Q

Plesiosaurs

A

Ocean dwelling reptiles

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3
Q

A defining feature of a dinosaur

A

A hole in their hip socket-
permitted upright stance and allowed dinosaurs to run faster than other reptiles of the same size.

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4
Q

Why are modern birds classified as a type of dinosaur?

A

Because they share a common ancestor with non avian dinosaurs.

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5
Q

Two Dinosaur sub-categories

A

Ornithischians- bird hipped dinosaurs

Saurischians- reptile hipped dinosaurs

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6
Q

Key evolutionary innovation of dinosaurs

A

Walk with a fully erect posture, holding their hind legs vertically under their hips.

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