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3.5 Billion Years Ago. This is how old fossil stromatolites have been dated. You can find modern versions of these same formations growing now off the coast of Australia.
About 3,500 million years ago.

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6y ago
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11y ago

Archae bacteria. They live in harsh environments and still to this day exist. Photosynthesis came about when an archae bacterium developed a chloroplast, which is what plants use to make energy.

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Q: When was the first life forms of bacteria?
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