[ExI] Discovery Suggests All Complex Life Came From Archaea

John Clark johnkclark at gmail.com
Sat Feb 18 23:43:38 UTC 2017


On Sat, Feb 18, 2017 at 5:17 PM, BillK <pharos at gmail.com> wrote:

Yes. Every earth species uses the same DNA proteins.  Multiple origins
> are far more unlikely than everything coming from one origin.
>

​The evidence strongly ​indicates that everything alive today are decedents
of just one organism, LUCA (the Last Universal Common Ancestor) that lived
between 3.5 and 3.8 billion years ago. But that doesn't mean that LUCA was
the first living thing, in fact it almost certainly was not; it's just that
lines of decedent other than LUCA's ended up going extinct. Perhaps LUCA
had some beneficial mutation, or more likely LUCA just got lucky.

John K Clark
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