Literary critics, however, frequently suffer from a curious belief that every author longs to extend the boundaries of literary art, wants to explore new dimensions of the human spirit, and if he doesn't, he should be ashamed of himself.
There's a lot more to being a woman than being a mother, but there's a hell of a lot more to being a mother than most people suspect.
Evolutionary biologists are not content merely to explain how variation occurs within limits, however. They aspire to answer a much broader question-which is how complex organisms like birds, and flowers, and human beings came into existence in the first place.