I can think of many, such as unique DNA.  Within moments of conception the new baby is blessed with his own DNA.  This DNA tells us 1) the baby is human and 2) she is not the mom or the dad.  In other words, from moments after conception the DNA tells us it is a distinct human individual.

Also, being anti-life subjects human dignity and value to a cost/benefit analysis.  For example, only 7% of abortions are performed for tough cases such as rape, incest or serious health problems.  That means the overwhelming majority of abortions aren’t done out of medical necessity (in fact, fully 50% of women having abortions admit to using it as a form of contraception).  So if, in the mother’s eyes, the costs of bearing the child are greater than the benefit, then she aborts the child.  Doing so devalues that child and it devalues all of us.

We find the similar logic used to argue for euthanasia and assisted suicide.  Where the cost of life is higher than the perceived benefit, Doctor’s should be able to help end life early, we are told.  Again, connecting the value of someone’s life to the costs of keeping them alive devalues all of us.  Once we connect the dignity of human life to some cost/benefit analysis, we are only as valuable as we are perceived to be.  The big question then becomes who gets to make that determination.

While my Pro-Life views are primarily religious, they are solidly supported by science and logic.