So nothing within the mechanisms generating change within a species is supposed to be impossible? So we have a mechanism that's guaranteed to produce divergence in gene pools isolated from each other in slowly changing conditions. We got that, right?
You accept the mechanism, but not how long/far it can operate?
Is something supposed to be impossible here? This is your alternate science?
My alternative science is what God has set into place, species will reproduce according to their own kind.
You have any species in the process of becoming another species while we speak?
Oh, that's right, that is only for the past, when the imagination of the evolutionists can run wild and make up creatures like they do in Sci-fi movies.