The Fourth Mass Extinction Occurred About 200 Mya at the End

question 25

Multiple Choice

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

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