The first mammals appeared during the ________ Period.
A) Cambrian
B) Devonian
C) Permian
D) Triassic

Question

Quizplus · Accepted Answer

The first mammals are believed to have appeared during the Triassic Period, which lasted from approximately 252 million to 201 million years ago. This was a time when the Earth's climate was generally hot and dry, and many new groups of animals were beginning to evolve. The earliest mammals were small and relatively simple in structure, but they eventually gave rise to a diverse array of species, including the familiar mammals that we know today.

The First Mammals Appeared During the ________ Period