So biology clearly says that a fetus in it's early stages is something at least not entirely human. Right. But what about "spiritually"? I mean, is a fetus a small person, or isn't it? The nervous system is normally developed enough to control some functions first after 18 weeks, and a fetus doesn't even feel pain until the third trimester. I'm not sure when it becomes disallowed to have an abortion, but the third trimester usually occurs at around 26 weeks, if I'm not mistaken, and no one is going to wait that long to have an abortion. And in any case, it's not even a fetus until the 11th week. Sure, that's some more biology, but even so, a fetus is little more than a tabula rasa.