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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.

然而，进化生物学家并不满足于解释变异是如何在一定范围内发生的。他们渴望回答一个更广泛的问题，那就是像鸟、花和人类这样复杂的生物体是如何产生的。

— Phillip E. Johnson 菲力普·詹森