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bgzhoumi bgzhoumi
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Posts: 678
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6 years ago

The geologic time scale was originally based upon ____.
  a. changes in Earths biota
  b. the theory of organic evolution
  c. the isotopes of minerals
  d. absolute ages of rocks based on radiometric age dates
  e. geographic mineral locations

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wrote...
6 years ago
a
bgzhoumi Author
wrote...
6 years ago
Great answer
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