We recognize that to many people such a statement of cold biological fact misses something essential about the developing fetus. We recognize that th… - Harold J. Morowitz

It is clearly in the best interests of everyone involved that these decisions be made with a maximum of compassion, a minimum of bureaucratic intervention, and the absence of attorneys.

Even with this abbreviated sketch of the process of fertilization, one thing is obvious. When biologists object to statements about life beginning at conception, they are not splitting hairs or being pedantic. There is no time in the sequence we’ve just described where new life is created. In fact, from the point of view of the biologist, at conception, two previously existing living things come together to form another living thing.

The net result is that slightly fewer than a third of all conceptions lead to a fetus that has a chance of developing. In other words, if you were to choose a zygote at random and follow it through the first week of development, the chances are less than one in three that it would still be there at full term, even though there has been no human intervention. Nature, it seems, performs abortions at a much higher rate than any human society. It is simply not true that most zygotes, if undisturbed, will produce a human being.