The First Mammals Evolved From

Question

The first mammals evolved from
A) dinosaurs.
B) birds.
C) therapsids.
D) reptiles.

Accepted Answer

The therapsids were a group of synapsids (mammal-like reptiles) that lived during the early and middle Permian period. It is believed that the therapsids evolved into the first true mammals during the Late Triassic period, about 200 million years ago. Therefore, choice C is the best answer.