物竞天择确保只有最适应环境的物种才得以生存下来，把基因传递给下一代。
Natural selection ensures only the fittest survive to pass their genes on to the next generation.
从受损区到更原始流区的基因流的数量急剧增加，导致了大量的基因流动，进而降低了后代的总体适应性。
Such a dramatic increase in straying from damaged areas to more pristine streams results in substantial gene flow, which can in turn lower the overall fitness of subsequent generations.
有可能是某些尼安德特人的基因让现代人类适应了新气候和新栖息地。
It is possible that some Neanderthal versions of genes enabled modern humans to adapt to new climates and habitats.
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