Abortion ends a pregnancy and as a result kills a developing human being. You only stated half the truth why leave out the other?
I'm not sure why some of you keep throwing out the decision in Roe V. Wade. I would think anyone debating here would be at least semi-familiar with it.
You should know by now that most pro-lifers aren't trying to deny a woman her right to privacy or her religious liberty, they typically just care about protecting human life.
There is a need to dehumanize a fetus, its typically much more difficult to kill a human if you first try to detract from it's humanity that's one reason I believe that pro-choicers often try to distort the truth or leave out crucial pieces like you did when you mentioned that abortion is the ending of a pregnancy. In any case it's much easier to kill a parasite or a leech then it is to kill a human.
A human embryo or fetus is developing into a human being, but it is not a developing human being, because, to be the latter, you already have to be a human being, and a human embryo or fetus isn't. If it were, it would not need to be biologically connected to and inside a woman's body.
I think it's disingenuous even to claim that abortion kills an embryo or pre-viable fetus. Anything that needs to be biologically connected to and inside the body of a member of its species does not have a life of its own. If you have a life of your own, it should be possible to extend that life in a scientific lab in a container other than such a body.
Though scientists aren't legally allowed to grow human embryos that way longer than 14 days, we know that human embryos can't be grown that way longer than 16-20 days even with the most powerful scientifically developed oxygen-rich nutrient known. That's because all other placental mammalian embryos they have tried to grow that way die after they reach the point of a doubling of the maximal pre-implantation life span of the particular species involved.
What is interesting is that, though a human organ removed for transplant can be kept alive for hours, an embryo dies immediately when the placenta/embryo unit is biological disconnected from the woman's body. This does not differ for spontaneous and induced abortion.
Show me an example of even one human being recognized as such which depends for life upon biological connection to another human being recognized as such in the same way.
Even conjoined twins do not present such an example. When each twin is recognized as a human being, it is because a body has two heads each of which can take in oxygen and nutrients from sources commonly available to both, so that if one died, the other could still live.
The only conjoined twin example comparable to woman and embryo is that of host and parasitic twins where the parasitic twin is completely inside and biologically attached to the host twin and lives there in the manner of a tumor.
No one considers removal of the parasitic twin to be killing of a human being, even though it is alive inside the host twin and dies immediately upon removal. Nonetheless, it is human, has human DNA, could even have unique human DNA, is living, and has its own form.