State Your Position

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Finally, you can explain why you think the most reasonable point at which to draw the line is at fertilization. Remember, the reason in a nutshell is that a person is best defined as a human organism, and human organisms come into existence at fertilization. It is very useful to state your definition of person explicitly, because it puts the pro-choicer in the position of having to come up with her own definition. And when one tries to define personhood in such a way as to accommodate a later starting point, it quickly starts to sound uncomfortably contrived.