And there go those goalposts, sailing down the field! Like I said, all pro-lifers have their goalposts mounted on wheels and motorized.
First you just said "develops into a human" defines what is worth of rights.
Now you've modified your description.
The point? You're just trying to define yourself as correct, which makes your position self-serving, dishonest, and not worthy of consideration. Not to mention totally arbitrary.
Given that your position is totally arbitrary, how do you justify using it to deprive people of rigths? Why should your arbitrary position be made law, and not the arbitrary position of the PETA freaks?