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  • Origin of Life
  • Which gas converted the earlier reducing atmosphere into ...
Multiple choice

Which gas converted the earlier reducing atmosphere into oxidising one?

  1. Carbon dioxide

  2. Oxygen

  3. Hydrogen

  4. Methane

  5. Ammonia

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The free oxygen produced by the blue-green algae converted the atmosphere from reducing into oxidising.

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