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_____ were the first organisms that released oxygen as a by-product of photosynthesis

_____ were the first organisms that released oxygen as a by-product of photosynthesis
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_____ were the first organisms that released oxygen as a by-product of photosynthesis

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User Nmjohn
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cyanobacteria or blue-green algae
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User Harden Rahul
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The answer is tiny organisms known as cyanobacteria
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User Ketav
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