Which was the first photosynthetic organism?

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(C) Cyanobacteria,also known as blue-green algae,were the first organisms to evolve oxygenic photosynthesis.They appeared on Earth approximately $3.5$

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Cyanobacteria

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(C) Cyanobacteria,also known as blue-green algae,were the first organisms to evolve oxygenic photosynthesis.They appeared on Earth approximately $3.5$ billion years ago.By releasing oxygen as a byproduct of photosynthesis,they fundamentally changed the Earth's atmosphere,leading to the Great Oxidation Event.

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