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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