anwarmuhsen11p5c1td anwarmuhsen11p5c1td

09-03-2018
Biology

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How do scientists determine when an era ends and an era begins

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crimsonpathway crimsonpathway

09-03-2018

Geologic Time Scale.Scientists decide when an era begins and ends, due to mass extinction. ...Scientists determine when drastic changes are made by the fossil record, which shows earths past organisms that have become extinct.

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