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The spans of time that make up the Earth's geologic timescale are generally defined by the different types of

A foods that humans ate at a given time.
OB. geologic processes that operated at a given time.
OC. technologies that humans used at a given time.
OD. organisms that lived at a given time.
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User Xsc
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Answer:

organisms that lived at a given time.

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User Yehor Nemov
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Answer:

organisms that lived at a given time.

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User Scandinave
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