Mammals arose as a dominant life-form after which event?
A) the start of the Quaternary period
B) the Cretaceous extinction
C) the Devonian extinction
D) the Cambrian explosion
Correct Answer:
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A)develop
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Q52: Modern birds are probably direct descendants of:
A)marsupials.
B)iguanas.
C)dinosaurs.
D)crocodiles.
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