According to Darwin's Survival of the Fittest, only those species that were able to the sudden great changes of their living conditions survived.
A. appeal to
B. relate to
C. adapt to
D. contribute to
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A. appeal to
B. relate to
(答案→)C. adapt to
D. contribute to
解析：A. appeal to吸引，B. relate to关于，理解，C. adapt to适应，D. contribute to对…有贡献，句意：根据达尔文的适者生存的理论，只有能够使用生活条件突然变化的物种能够幸存。所以选C。