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16 July, 20:59

What was first responsible for changing the formerly poisonous atmosphere to an oxygen-rich atmosphere as we have today?

Meteor impacts

Volcanic gases

Earthquakes

Photosynethic bacteria (Cyanobacteria)

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Answers (1)
  1. 16 July, 21:20
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    Photosynthetic Bacteria, They take the carbon dioxide and sunlight and turn it into Glucose and Oxygen, then releases the oxygen because they don't use it.
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