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

Respuesta :

division of Earth's history into time units based largely on the types of life-forms that lived only during certain periods.

Answer:

A.

technologies that humans used at a given time.

B.

foods that humans ate at a given time.

C.

organisms that lived at a given time.

D.

geologic processes that operated at a given time.

Explanation:

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