Answered

Which unit of geologic time is the oldest?

A. Cenozoic
B. Mesozoic
C. Ordovician
D. Precambrian



Answer :

GinnyAnswer

Final answer:

The oldest unit of geologic time is the Precambrian.


Explanation:

Precambrian is the oldest unit of geologic time, encompassing the Hadean, Archean, and Proterozoic eons. This period covers the majority of Earth's history, with life forms consisting mainly of simple single-celled organisms.


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