Perhaps the most straightforward relation between you or me on the one hand and every human fetus from conception onward on the other is this: All are living members of the same species, homo sapiens. A human fetus, after all, is simply a human being at a very early stage in his or her development.
— David Boonin, A Defense of Abortion (New York: Cambridge University Press, 2003), p. 20
Defining a Human Being
