nnnnnhamilton1271 nnnnnhamilton1271
  • 06-07-2017
  • Biology
contestada

Large amounts of oxygen gas appeared in earth's atmosphere about ______ years ago.

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Corra1
Corra1 Corra1
  • 08-07-2017
perhaps as long ago as 3.5 billion years ago and certainly by 2.7 billion years ago.
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