First I have to say I love science. There is a problem we all have.
That problem is what is life and what is not.
With our quest 2 find life elsewhere in the oceans or on another planet or moon with a sea of water under the ice how do we classify it? whould it look us in the face and say "hello" and pay my back taxes? Or be a single celled organism.
We operate on tumors because even tho they are alive they are cells that have gotten the genetic code wrong and have mutated.
A tape worm on the other hand don't have any other purpose then to get inside you and live off of you, unlike a potential human child it has no potential for love or hate. It wants to be there to harvest your energy. As with an embro or fetus it never asked to be there and it never asked to be decapitated in the womb.
But there is ONE FACT I will say, "Most woman that have made the choice to have an abortion have regreted the decision leaving some to become manic depressive.
Maybe once you have the potential of becomming a parent the choice to terminate wont be so clear because once its made there is no going back you will always remember "My aborted fetus should be 14 today." You will never forget the one you gave up to the DUMPSTER no matter how many childern you let live.