The __________ asteroid hypothesis proposes that an asteroid impact led to the extinction of dinosaurs.
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Q61: Many amphibians now face extinction, and one
Q61: _,or four-legged walkers,evolved from lobe-finned bony fishes.
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Q63: Give the bird-like and reptile-like features of
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Q67: Reptiles are _ (cold-blooded animals)with scales.
Q67: _ are tetrapods that live on land
Q68: _, the first vertebrates able to complete
Q69: A _ is an organ that allows
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