There is no way we could wipe out ALL life on Earth. A decent portion, yes. All, no.
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Yea in nuclear fall out cock roaches would still live.
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Pretty much all ocean life would make it, if it's food supply survived.
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No the water would be radiated and can't support life
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I mean twilight-depth and below.
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Even in the deepest parts which we have yet to explore but maybe never will?