there can't be a single argument or way to justify the "rightness" or "wrongness" of a topic like this, however u may go about defining what is right or wrong. it depends on what standpoint u look about it at. In my opinion, if you look, for example, at people who are being kept alive in hospitals on life support, you will see that the doctors refer to them as, for lack of a better word, dead. or not alive. this is because they are not providing for themselves in order to survive on their own. essentially, they need an outside source in order to keep them alive and keep their vital bodily functions working. in this case the outside source is in fact the life support machine itself. if you compare it to a zygote or the undeveloped child in a woman, the situation is very similar. the zygote or undeveloped child has no way of supporting for itself and cannot live without an umbilical cord to feed it. in this sense you can argue that just like the life support scenario argued that a living being is something that can survive on it's own, you can say that the zygote or undeveloped baby is in fact not a living creature or being, but it does in fact have potential for being alive. so if you look at it on the standpoint where you say it indeed has the potential to be alive, you can say abortion is wrong and does potentially end life. but if you look at it as not being alive as pertaining to the life support scenario, you could say abortion is not morally "wrong".