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Which evidence suggests that some of the first life on earth was prokaryotic bacteria?
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Which evidence suggests that some of the first life on earth was prokaryotic bacteria?

User Cosmin Onea
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Microbial mats or large biofilms may represent the earliest forms of prokaryotic life on Earth; there is fossil evidence of their presence starting about 3.5 billion years ago.
User Nirav Kamani
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