The prebiotic atmosphere of the earth was of a reducing nature. It was transformed into a oxidising atmospehre of present day due to the emergence of
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Cyanobacteria or blue-green algae are photosynthetic prokaryotes. These are the organisms that evolved 3 million years back.
They perform oxygenic photosynthesis where they used water to get hydrogen and released oxygen in this process.
Hence, they added oxygen to the atmosphere and paved the path of the evolution of aerobic forms including aerobic bacteria.
Explanation:
Cyanobacteria is the answer
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