Does this mean an animal couldn't just spring into existence without natural parents (maybe from a rock?) or be zapped into existence, Adam-and-Eve-like, without parents? Or that it couldn't, say, be synthesized in a lab? I will discuss such scenarios in Chapters 7 and 8 [Looking forward to it -Z], but the first two cases do not invalidate the point: for them to obtain would require some sort of miracle. To say that Socrates's nature requires that he have parents must be taken to mean that in the natural order of things he must have parents. (For more about the laws of nature and the natural order of things, see Chapter 6 [Ditto]). This should be distinguished from a metaphysical impossibility in the absolute sense: for instance, that nothing can come into existence wholly uncaused is metaphysically impossible in the absolute sense - not even by a 'miracle' could it happen. Socrates nature is of a kind of thing that comes into existence via a biological generative process, whether or not the process involves some degree of human artifice beyond or instead of normal sexual procreation. Moreover, since Socrates might spring into existence without parents - or so I claim - it is not the case that he has parents in every world in which he exists.So far, it seems to me that by jimmying a little terminology we can make A-T as compatible with a 'compatibilized' ID as it presumably is with the investigation of miracles for causes of sainthood (ignoring the "make life in a lab" thing, for now). The ID conclusion (whether warranted or not is a different subject) that nature on its own is incapable of producing a gorilla starting from a world where nothing lives but prokaryotes is a probabilistic inference to either the intervention of some intelligent cultivation (like a dog breeder breeding a new kind of dog) or a miracle.
If it isn't in the nature of bacteria to selectively breed "in the wild" until their progeny are giving birth to gorillas, then the historically verified geological transition from a world of bacteria-only to bacteria-and-gorillas can only be explained by some additional outside factor: intervention by super space aliens or miracle of God, say. If the facts on the ground lead to that conclusion, why would the A-T philosopher have any objection? So far I haven't seen any reason why; but hey, there are 249 pages to go, and it looks like chapters 7 and 8 will be the fun stuff.