When does a human being begin to exist? That question is at the very heart of the abortion debate, yet it is far from susceptible to a sure answer. This much is beyond serious dispute: biological life begins at fertilization, when the female's egg is united with the male's sperm. But does a collection of cells constitute a human being? Some biologists believe that fertilization does mark the beginning of humanity, since the fertilized egg is a distinct and unique genetic entity. This belief shores up the antiabortion argument of Catholic bishops as...
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