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earliest fossil evidence of life on Earth, but their origins may be volcanic. 3.465-billion-year-old Australian Apex chert rocks may once have contained microorganisms, although the validity of these findings has been contested. "Putative filamentous microfossils," possibly of methanogens and/or methanotrophs that lived about 3.42-billion-year-old in "a paleo-subseafloor

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