When did the 1st bacteria appear on Earth? – InterviewSolution

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1.	When did the 1st bacteria appear on Earth?
Answer» 3.5 billion years agoExplanation:BACTERIA have existed from very early in the HISTORY of life on Earth. Bacteria fossils DISCOVERED in rocks date from at least the Devonian Period (419.2 million to 358.9 million years ago), and there are convincing ARGUMENTS that bacteria have been PRESENT since early Precambrian time, about 3.5 billion years ago.

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