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A comment on Chances of E.T. Living Subsurface Ocean of Enceladus Given Major Boost. Parent comment

Re:Chances of E.T. Living Subsurface Ocean of Enceladus Give... by XR0CSWV3h3kZWg on Monday November 13, 2017 @05:15PM (#15690786)
Most of life's time on earth was single celled (life started ~4.1 Billion years ago, multi-cellular ~1.7 Billion years ago). If the world wasn't filled with O2 or sexual reproduction didn't start life on earth could still be single celled.
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