The Fourth Mass Extinction Occurred About 200 Mya at the End
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, the first birds, and many flowering plants
C) Silurian; insects, birds, and mammals
D) Carboniferous; insects, birds, and mammals