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This new entity, initially a single totipotent cell, then divides into two cells, then (asynchronously) three, then four, eight, and so on, enclosed all the while by a membrane inherited from the oocyte (the ), which then dissolves during implantation, allowing for continued growth in the direction of maturity as a member of the species.Even prior to implantation, however, these cells and membrane function as parts of a whole that regularly and predictably develops into the more mature stages of a complex human body.This shows that the zygote already —albeit at an early stage of his or her development. Paulson objects to HHS’s claim that life begins at conception not because it contradicts the overwhelming scientific consensus, but because he has decisive arguments against that view?We can’t rule that out so let’s examine his arguments.

Second, Paulson suggests that, because fertilization is a process, it can’t be the point at which a new human being comes to be. Nearly 48 hours pass from the time sperm first bind to the outside of the , the human eggshell, until the first cell division of the fertilized egg.” But this argument too is stunningly weak.The biological activity of an oocyte is directed toward successful fertilization; the biological activity of sperm is directed toward penetration of an oocyte.The biological activity of the new entity that results when sperm and oocyte fuse, however, is directed toward nothing less than the development of a mature human organism, distinct from either parent.The Science of Embryology The following are typical examples—only three of the many, many we could cite.These are from standard texts by embryologists, developmental biologists, and microbiologists: “Human life begins at fertilization, the process during which a male gamete or sperm unites with a female gamete or oocyte (ovum) to form a single cell called a zygote.

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