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10-03-2017
Chemistry

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Describe the origin of the oxygen in the atmosphere

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017marsmars017 017marsmars017

23-03-2017

Cyanobacteria appeared about 3 billion years ago in the oceans, the first organisms to develop photosynthesis. These bacteria used CO2 and H20 to produce sugar, and as a by product, produced and released oxygen (O2).

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