Why not? We can see genetic codes are clearly heriditary and carry information. Sooner or later they will be so different as to prevent cross-breeding, at least usually. Therefore different species. I'm not sure there is any sensible way to argue against that, at all.Well domestic animals like dogs, cats and even cows (I think) are still interbreedable with their wild ancestors. Till that changes I'm not sure if we can talk about different species. When we can, however...
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