Which organism was the first to create an oxi | vedclass

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(A) The early Earth's atmosphere was reducing in nature. Cyanobacteria (also known as blue-green algae) were the first organisms to perform oxygenic p

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Cyanobacteria

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(A) The early Earth's atmosphere was reducing in nature. Cyanobacteria (also known as blue-green algae) were the first organisms to perform oxygenic photosynthesis. By splitting water molecules,they released $O_2$ as a byproduct,which gradually accumulated in the atmosphere,leading to the transition from a reducing to an oxidizing atmosphere.

Which organism was the first to create an oxidizing atmosphere on Earth?

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