CiaraDenise
CiaraDenise CiaraDenise
  • 17-06-2016
  • Geography
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Until the early _______ there were only negligible amounts of free oxygen in the atmosphere.

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taskmasters
taskmasters taskmasters
  • 24-06-2016
During the early earth, when photosynthesis has not yet evolved, there were only negligible amounts of free oxygen in the atmosphere. It was said that the Earth's  atmosphere had no free oxygen then. This is about 3.5 billion years ago.
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