The beginning of the ________ era is marked by the appearance of the first life forms with hard parts.
A) Precambrian
B) Paleozoic
C) Mesozoic
D) Cenozoic

Question

Quizplus · Accepted Answer

The Paleozoic era is known as the era of ancient life, and it is marked by the appearance of the first life forms with hard parts, such as shells and exoskeletons. The other eras listed, the Precambrian, Mesozoic, and Cenozoic, are all characterized by different biological and geological events.

The Beginning of the ________ Era Is Marked by the Appearance