Which organisms changed the Earth's atmospher | vedclass

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(C) Cyanobacteria appeared in the Precambrian period around $3.2$ billion years ago. They were the first organisms to perform oxygenic photosynthesis,

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Photoautotrophs

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(C) Cyanobacteria appeared in the Precambrian period around $3.2$ billion years ago. They were the first organisms to perform oxygenic photosynthesis,releasing $O_2$ as a byproduct. This accumulation of oxygen led to the conversion of the primitive reducing atmosphere into the present-day oxidizing atmosphere,an event known as the oxygen revolution.

Which organisms changed the Earth's atmosphere from reducing to oxidizing?

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