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3 votes
Geologists have divided Earth's history into time units, which are largely based on

A. oral histories.
B. fossils.
C. written correspondences.
D. climates.

User Tamecka
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2 Answers

3 votes
i would assume B. Fossils
User Camillo
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0 votes
I'm assuming fossils but also oral histories
User Mike Hanafey
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