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[–] 25 points 1 year ago (1 child)

And there's a good chance that other life would be chemically or structurally similar, so without DNA evidence we'd confuse it's fossils with others (see Prototaxites).

Also, maybe life does reoccur relatively frequently, but is killed by existing bacteria, viruses, bacteriophage... again, for being too chemically/structurally similar to the existing life.

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