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4 votes
The time units used by scientists to divide Earth's history are part of the

A. 180° longitude.
B. geologic time scale.
C. 360° latitude.
D. 24-hour model.

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User Air
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1 Answer

2 votes
The time units used by scientists to divide Earth's history are part of the "geologic time scale," since when measuring extremely long time-spans, it is often helpful to look to the Earth's crust for clues of life from the past. 
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User Mariobgr
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