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8 August, 22:04

Eras, like the Paleozoic, Mesozoic, and Cenozoic periods are separated into periods by which marker?

Question 4 options:

Changes in rock layers

Species extinction

100 million year chunks

The types of living organisms that were present

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Answers (1)
  1. 8 August, 22:28
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    Eras are divided according to mass extinction. More specifically, when a type of species was most prominent on land. For example, we are living in a mammal dominated era - the cenozoic.
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