Clearly, standard fetology and embryology textbooks confirm that after fertilization takes place, a distinct human being exists. In light of this evidence, pro-abortion advocates rely on other appeals to "choice", "women's rights", and "privacy" as the foundation for their arguments. As you will see later on, these appeals do not substantiate the claims being made for their justifications for taking precious and defenseless human life.
1.) O'Rahilly and Muller, Human Embryology & Teratology (New York: Wiley-Liss, 2001): p.88.