Question

Which era of geological time lasted the longest?

a. Mesozoic
c. Precambrian
b. Cambrian
d. Cenozoic

Answer 1

The answer is (a) Mesozoic and it lasted 180 million years.

Answer 2

a. Mesozoic

Step-by-step explanation:

Out of these options, the Mesozoic Era is the era of geological time that lasted the longest. This era lasted roughly from 252 to 66 million years ago. The term "Mesozoic" means "middle life" and is divided into the Triassic, Jurassic and Cretaceous. This era also saw the gradual rifting of Pangaea into separate landmasses.