Question

The largest mass extinction event in the history of the Earth occurred at the end of the _______ period.

A. Permian
B. Cambrian
C. Devonian
D. Ordovician
Help! (Penn Foster)

Answer 1

I believe its A
Permian

Answer 2

The largest mass extinction event in the history of the Earth occurred at the end of the _______ period.

Answer: permian

hope this helps :)