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Noun: Proterozoic eon
  1. From 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
    - Proterozoic, Proterozoic aeon

Type of: aeon, eon

Part of: Precambrian, Precambrian aeon, Precambrian eon, Precambrian period

Encyclopedia: Proterozoic eon

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