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) what appears to be one criterion that scientists use when defining the timing of geologic periods?
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) what appears to be one criterion that scientists use when defining the timing of geologic periods?

User Sam Murphy
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16 votes

Answer:

They use the geologic time scale to answer questions from the past about animals and why the became extinct or why they are becoming extinct and to know more about the earth in the past. They can also find out new facts about animals and find out about DINOSAURS.

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User Thegreatt
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