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Re:Tardigrades may now be living on Moon by en-us on Wednesday August 07, 2019 @09:31AM (#20634501)
We can sequence its DNA and see how similar it is to the ones on Earth. If there are living organisms on the moon that share a common ancestor with Earth tardigrades then they diverged a very long time ago and their DNA will reflect that. But if their DNA is identical to those on Earth then we know they came from Earth.
Re:Tardigrades may now be living on Moon by dwiel on Wednesday August 07, 2019 @09:35AM (#20634527)
Do you know how much tardigrades DNA have changed since they first appeared on earth?
Re:Tardigrades may now be living on Moon by en-us on Wednesday August 07, 2019 @01:59PM (#20637173)
I do not know exactly how much but this is something that can be approximately quantified.