2. What was the first source of oxygen?

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asked Jun 23, 2021 186k views

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Chetan Shenoy · Answer 1 · 2021-06-29T18:52:33+0000

The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen

2. What was the first source of oxygen?

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