If Mendel had live just a little longer, I think he'd have found stronger evidence for evolution and may have changed religious stances against it.
Before anyone pounces me, I mean it in he would've found more things about cross-breeding/pollenating flowers as well as discovering more about how he can perpetuate the flowers and fauna to survive harsher conditions, thus ensuring survival of the fittest.
It does seem to be a huge leap of faith, though to suggest that genetics alone proves that all organisms on earth have a common ancestor.
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