Yes, an acorn becomes something entirely different -- anatomically and physiologically.
Ontologically?
Interesting, so taking this comparison directly, a person is an entirely different thing than the fetus I would suggest it shares an ontological identity with, if I were to dump a chemical that only affected fetuses during a specific developmental timeframe, well before you would declare this new thing comes into being, say that prevents the development of one leg. Should the person, who is not identifiable with the fetus, be able to claim compensatory damages? To be consistent, I didn't harm the person, that's a different thing than the fetus? Or no? Sometimes a fetus is identifiable with the person it "becomes"?
You see
@9-10ths_Penguin, I do believe that fetuses deserve rights well and above the simple right to not be murdered by its mother. Your tunnel vision with regards to abortion aside, fetuses currently have many protections in the law rightfully based on their value and status as a full human being. Including standing to bring suit, or have suit brought on their behalf, against someone that harmed them through negligence or maliciousness.
Please lift with your legs as you move those goalposts. I wouldn't want you to pull something.
Back's just fine. It turns out "the difference is in the stage of biological development", "the difference is that one is more biologically developed" and "differences attributable to development" share the exact same coordinates, weirdly like they are the same thing.
Thanks for your concern though.