The fourth mass extinction occurred about 200 mya at the end of the ________ period.This extinction eliminated 35 percent of the existing animal species including ________.
A) Triassic;reptiles,early dinosaurs,and the first mammals
B) Jurassic;dinosaurs,first birds,and many flowering plants
C) Silurian;insects,birds,and mammals
D) Carboniferous;insects,birds,and mammals
Correct Answer:
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