Making abortion illegal would reduce the number of abortions, by increasing cost and risk. Despite the latter affect, a net number of lives would probably be saved.

Personally, I don't see how a mindless lifeform can be considered to be a human being, given that a being by definition must be self aware. I am appalled that thousands to millions of persons are dead, dieng, and going to die, for the sake of the temporary structural integrity of blastocytes.

Though humanity's general excuse for valueing itself above animals is that it is more intelligent than them, in practice we don't follow that arguement of value based on intelligence to its logical effect. The punishment for killing a genius is same as that for killing someone with severe mental retardation.

I refuse to think that an vegetable is a person, but I am open to the arguement that many who are dumber than a substantial number of adult apes are persons. A person in my opinion is both a being and human. I'll revise that definition should I ever learn of the existence of any specific intelligent ET life.

When does a human become a being?

It varies. I know, through memory, that I was one before my infancy ended. All we can possibily do in this regard, is make educated guesses. I personally think it is unlikely enough that one is a being before being born, that at that point ones life can be disgarded morally.

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A closed mind is a dead mind.