Well here are some fun facts: Pregnant women’s bodies are basically swimming with the cells of their fetuses. And even when they give birth, some cells remain. By the end of the first trimester of pregnancy, cells from the fetus account for one in every 50,000 cells in the woman’s body. Further along in the pregnancy, it increases to one in 1,000. Six percent of the DNA in her blood plasma also comes from the fetus. Which is interesting given some standard pro-life arguments like this:
The fetus growing within her womb is a separate person with its own distinct genetic makeup. Abortion does not remove some part of the woman’s body; it destroys the body of a separate, unique individual.
Unfortunately humanity and life and the human body and development are slightly more complicated than just cells or DNA.