Reddit reviews Biological principles and modern practice of obstetrics

Here are three textbooks that cover that a zygote is a unique, living, human life.

Care to provide any sort of statement on why, exactly, a zygote, which is scientifically human, alive, and unique, is not a human life? If you want to argue personhood, that's not science, that's philosophy of the mind, and we can go down some dark paths about what constitutes a human. If you want to argue science, there's no argument to be made.

Even people like Peter Singer concede this, because there's nothing to be argued against it. People that want to try and argue against it are trying to morally rationalize their decisions or wants, at least be consistent with it.