The atmosphere became oxidising with the appe | vedclass

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(B) Autotrophic cyanobacteria were the first organisms to perform oxygenic photosynthesis.They used $H_{2}O$ as a hydrogen donor to obtain hydrogen fo

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Autotrophic cyanobacteria

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(B) Autotrophic cyanobacteria were the first organisms to perform oxygenic photosynthesis.They used $H_{2}O$ as a hydrogen donor to obtain hydrogen for carbon fixation,which resulted in the release of oxygen as a byproduct.This process led to the accumulation of free oxygen in the atmosphere,causing it to become oxidising.

The atmosphere became oxidising with the appearance of

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