Before the division of the geologic time scale into eons,the Hadean,Archean,and Proterozoic eons were collectively called
A)Paleozoic time.
B)Precambrian time.
C)Phanerzoic time.
D)Cambrian time.

Question

Quizplus · Accepted Answer

The Hadean, Archean, and Proterozoic eons, which precede the Phanerozoic eon, are collectively referred to as Precambrian time. This term encompasses the vast span of time before the Cambrian period, which marks the beginning of the Phanerozoic eon and is characterized by the first appearance of complex life.

Before the Division of the Geologic Time Scale into Eons,the