The evidence suggests that warblers use their extremely elaborate songs primarily to attract females, clearly confirming the effect of intersexual selection on the evolution of birdsong.

证据表明，莺主要用它们极其精致的歌声吸引雌性，这清楚地证实了雌雄间选择对鸟类鸣叫进化的影响。

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"[one] effect of lower testosterone levels is loss of muscle mass and increases in fat mass," Prof Bribiescas writes in his book How Men Age: What Evolution Reveals About Male Health and Mortality.

“睾酮水平降低的影响之一就是肌肉含量减少、脂肪含量增加，”布比斯·卡斯博士在《男性的衰老之旅：进化所揭示的关于男性健康和死亡的真相》一书中写道。

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Each tone will have the effect of clearing the distortion one is currently working upon within one's given level of evolution.

每个音调都将具备清除你在当前进化水平中正在处理之扭曲的效果。

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There is, of course, the question of how much this matters, for most mutations have little effect and a rare few, the stuff of evolution, are actually beneficial.

ECONOMIST: Genetic damage and paternal age