3 ms·
"life on Earth started with a single organism that replicated." I would tend to ponder that life in it's simplest form is not singular and never has been and t
by oblib 9y ago
"life on Earth started with a single organism that replicated."
I would tend to ponder that life in it's simplest form is not singular and never has been and this is the cause of evolution.
- dredmorbius 9y agoAvailable evidence suggests that life on Earth has a common ancestor. This doesn't mean it was the only origin of life on Earth, but it is the only surviving line. It also took a few days for complexity to arise. About a trillion of them.
- oblib 9y ago"Available evidence" : that's because we still don't know how to look for it, or what to look for, and the reasons for that are complexity and time.
- dredmorbius 9y agoWrong. "Available evidence", because there are no extant lifeforms which diverge from the known set of amino acids, no prokaryotic life which doesn't have (or at least didn't once have) mitochondria, utilisation of the Krebs Cycle, and numerous other elements. Again, other variants might have emerged. But they haven't survived, suggesting the extant line out-competed (or possibly out-lucked) any challengers