As for what we are all talking about a few pages ago:
Human Being =
(fertilized egg > fetus > unborn baby > birth > child > teen > adult > senior > death)
That doesn't make sense to me. I think a human being starts when the fetus becomes developed enough to be an "unborn baby." And I don't think I'm out of line. I just seriously doubt that if you showed a zygote to a random person they'd voluntarily say "oh yeah, that's clearly a human being."
It certainly doesn't have the qualities necessary to take advantage of any rights. It borders on non sense to even talk about it in those terms. But I don't want to go too far down that road, because as I've said before... All roads are empty when you start down the teleological.