brenaroo14 brenaroo14
  • 28-09-2017
  • Biology
contestada

20. Most of today’s organisms could not have lived on Earth 3.6 billion years ago because there was no _____ in the air then.

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sweetangels4
sweetangels4 sweetangels4
  • 28-09-2017
oxygen, mostly bacteria and they ran on glycolosis
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