how do scientists determine when an era begins and when it ends?​

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Answer:

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.

Explanation:

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Answer:

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.

Explanation:

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