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How did photosynthetic bacteria begin to change the Earth 3.5 million years ago?

April 26, 2017bacteria Biology earth Mathematics million photosynthetic

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How did photosynthetic bacteria begin to change the Earth 3.5 million years ago?

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The primordial atmosphere did not contain oxygen. The photosynthetic bacteria carried out photosynthesis and produced oxygen from water and fixed CO2 into carbohydrates. The presence of oxygen in the atmosphere enabled high forms of life to evolve.