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Effects of Past Global Change on Life (1995) / Chapter Skim
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Pages 28-28

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From page 28...
... THE END OF THE PROTEROZOIC EON In the Cloud model, the other principal period of linked environmental and biological evolution is the end of the Proterozoic Eon, when further increases in PO2 are thought to have allowed the evolution of macroscopic animals. Here the relative strengths of the three lines of evidence are reversed.
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Key Terms

  • macroscopic animals
  • cloud model
  • earth history
  • fossil record


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