During the Cenozoic Era,__________ rapidly diversified to fill the ecological niches left by the K-Pg mass extinction.
A) birds
B) dinosaurs
C) mammals
D) crocodiles

Question

Quizplus · Accepted Answer

The K-Pg mass extinction wiped out all non-avian dinosaurs, leaving ecological niches open for other organisms to fill. Mammals rapidly diversified during the Cenozoic Era and became the dominant land vertebrates. While birds and crocodiles also diversified during this time, mammals were the group that filled the most ecological niches.

During the Cenozoic Era,__________ Rapidly Diversified to Fill the Ecological