Abortion is a debate that continues day in, day out, year in, year out. We have laws that have been set into place, yet the debate continues. The opposing sides in the debate each strongly believe they are right. The pro-choice supporters see a woman's right to choose as central to the debate. The pro-choice advocates see the life of the baby as the most important concern. Very little middle ground exists on the issue of abortion.
I. When Does Life Begin?
 "Development of the embryo begins at Stage 1 when a sperm fertilizes an oocyte and together they form a zygote."
— England, Marjorie A. Life Before Birth. 2nd ed. England: Mosby-Wolfe, 1996, p.31
"Human development begins after the union of male and female gametes or germ cells during a process known as fertilization (conception).
"Fertilization is a sequence of events that begins with the contact of a sperm (spermatozoon) with a secondary oocyte (ovum) and ends with the fusion of their pronuclei (the haploid nuclei of the sperm and ovum) and the mingling of their chromosomes to form a new cell. This fertilized ovum, known as a zygote, is a large diploid cell that is the beginning, or primordium, of a human being."
— Moore, Keith L. Essentials of Human Embryology. Toronto: B.C. Decker Inc, 1988, p.2
 The Developing Human: Clinically Oriented Embryology, 6th ed. Keith L. Moore, Ph.D. & T.V.N. Persaud, Md., (Philadelphia: W.B. Saunders Company, 1998), 2-18:
"[The Zygote] results from the union of an oocyte and a sperm. A zygote is the beginning of a new human being. Human development begins at fertilization, the process during which a male gamete or sperm ... unites with a female gamete or oocyte ... to form a single cell called a zygote. This highly specialized, totipotent cell marks the beginning of each of us as a...