razethetower
razethetower razethetower
  • 08-10-2016
  • Biology
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Unlike the atmosphere today, the atmosphere 3.5 billion years ago did not contain...?

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FreshNutz
FreshNutz FreshNutz
  • 08-10-2016
Unlike the atmosphere today, the atmosphere 3.5 billion years ago did not contain... ozone
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Аноним Аноним
  • 08-10-2016
CARBON MONOXIDE???? im only in middle school but that is my best guess
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