Asked by caleb
In which eon did the first bacteria appear?
Hadean
Proterozoic
Archean
Mesozoic
All Answers 1
Answered by
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Archean
The earliest evidence for bacteria (microfossils, stromatolites, and isotopic signatures) comes from the Archean eon, starting around 4.0–2.5 billion years ago.
The earliest evidence for bacteria (microfossils, stromatolites, and isotopic signatures) comes from the Archean eon, starting around 4.0–2.5 billion years ago.
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