In response to the OP, a pesky little thing called genetic limitations. Examples:
A horse and a donkey can be bred..... once. The outcome is a sterile crossbreed. The females are almost always sterile and the male is ALWAYS sterile. There will never be a reproducing population of horse/donkey mixes. This is the end of their genetic limitation.
Dogs and foxes cannot interbreed.
Many creatures that would seem to be very close anotomcally, cannot mingle. There are genetic limitations.
As expected by evolution: species split and become genetically distinct, to the extent that cross-breeding, if at all possible, doesn't yield fertile offspring. What was once once species, is now two.
Of course, to the evolutionist, a cow can eventually become a whale over "long periods of time" and somehow that's "scientific", but what we see in the real world is that there are limitations on how far an animal can actually go.
What you say here has no bearing on what you said before.
First, cows won't become whales. Species don't evolve into pre-existing species. I'd err that you were being farcical, but there are people who genuinely don't realise this.
Second, the genetic limitations you describe first relate to the genetic
distinctiveness of horses and donkeys, dogs and foxes, etc. The limitation exists inasmuch as the two species can no longer interbreed, and so evolution in one population won't cross over to the other. This limitation is otherwise known as
speciation, and is a cornerstone of evolution.
What you describe next is something altogether different. You are now saying there's a limit on how distinct a species can evolve from its
ancestral species. That's using the word 'limitation' in a completely different way, has nothing to do with the first part of your post, and is unsupported by the evidence.
Evolution explains why donkeys and horses can only breed infertile offspring, that's not evidence against it at all. The second, completely different thing you said, is simply an unsubstantiated claim - there's no evidence that species are somehow limited in how distinct they can become from their ancestral species, and all the evidence in the world that species as distinct as jellyfish and birds share a common ancestor.
So... no, neither are evidence against evolution
