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What were the first organisms to release oxygen into the atmosphere?
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What were the first organisms to release oxygen into the atmosphere?

User Blacklight Shining
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Cyanobacteria is your answer.
Hope this helps!
~{Oh Mrs. Believer}
User TechWatching
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The answer is going to be Cyanobacteria or blue-green algae became the first microbes to produce oxygen by photosynthesis,
User Dylan McNamee
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