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arroba
It has come to my attention that because the genetic code isn’t quite universal some people think that is grounds for calling into question how many more than one common ancestor there might be.
I would point out that the vast majority of deviations from the standard code are in mitochondria not nuclear genetic code.
Even so, there are far fewer points of deviation than there are points of similarity. The salient question is not “how did these 8 of 64 codes come to be different with a common ancestor” but rather “how did these 56 of 64 codes come to be the same without a common ancestor”.