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It's very improbable that you would ever regain a lost compatibility. And there's no way for the environment to start selecting for mating with incompatible partners.

It's very improbable that you would ever regain a lost compatibility.

Absolutely.

But the claim was that speciation was irreversible.

I don't believe there's any reason to believe that's true. Altho it is certainly veeeeeery unlikely, since the environment would have to select for it.

But I see no reason to assume it's impossible.

I'm thinking of things like species losing fins, then gaining them again, like whales supposedly did.

It's very improbable that you would ever regain a lost compatibility. And there's no way for the environment to start selecting for mating with incompatible partners.

You are putting your foot deeper and deeper in your mouth with your double-talk. Maybe with the next post you will be able to get it out the other end! Of course the same thing is an argument against evolution itself - the incompatibility of partners. But of course evolutionists have an excuse for that one - their deux ex machina 'natural selection' will perform the miracle of keeping the whole species evolving at an even rate so that they will always be able to mate. Who says evolutionists do not believe in miracles!