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How do scientists think Prokaryotic Cells contributed to changing Earth’s atmosphere to include more oxygen?

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Step-by-step explanation:

Then, about 2.5 billion years ago, oxygen started getting added to the atmosphere by photosynthetic cyanobacteria. “Oxygen is produced as a waste product of photosynthesis. ... “The production and burial of plant matter over long periods causes oxygen levels to rise,” explains Poulsen

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