Darwin's theory of natural selection is intended to answer this question.

达尔文的自然选择理论正是为了回答这个问题。

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And the challenge was the theory of evolution by natural selection.

其中极富挑战性的观点则是生物进化是通过自然选择实现的。

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And the challenge was the theory of evolution by natural selection.

其中极富挑战性的观点则是生物进化是通过自然选择实现的。

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