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On the other hand, we do not know with any kind of certainty whether we got from a single celled organisms to our current state via mutation and natural selection.

What does that have to do with the Theory of Evolution?

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What does that have to do with the Theory of Evolution?

For many evos on FR, that is the theory of macroevolution. You must be one of the ones that only believe evolution goes back to our mysterious common ancestor we have with the apes. But many others believe evolutionary theory takes us all the way back to a single celled organism.