Natural selection and survival of the fittest（物竞天择,适者保存）是“物竞天择,适者保存”：）~物竞天择是：Natural selection. 适者保存是：survival of the fittest.hehe:)没那么复杂的^ ^
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Natural selection and survival of the fittest
Thing border it selecting Survival of the fittestis it perfect? lol20级礼包
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