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There s no evidence on your side of this either, it's all conjecture, and I do have logic on my side.
No, the weight if the evidence is against your idea of inevitably declining diversity and if you have "logic" on your side I have yet to see it. Certainly you have not been able to answer my reasoning that a mere reduction in genetic diversity cannot explain loss of interfertility or offer any explanation of how it could to point to just one example. If the loss of interfertility relies on genetic change as I would argue then your argument is in trouble.
And I'll add that given your assumption that Noah's Flood the genetic diversity of species prior to the Flood doesn't matter. All the matters is the genetic diversity of the survivors on the Ark. And for unclean species, restricted to a single pair that amounts to 4 alleles per locus unless you want to propose exotic genomes again (and THAT would be sheer conjecture).
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Again if it could be tested genetically as I've described then we'd know if my prediction is correct or not.
I think you mean that you reject the tests available because they don't support you.
It's a fact that we haven't seen domestic varieties "speciating" in your sense even though they are placed under more intense selection than natural species - and still need a degree of artificial selection to be to be maintained. You can't show a single example that supports your "species are just genetically depleted varieties" argument.