The chimpanzee and human lineages shared a common ancestor just six million years ago, a short slice of evolutionary time.

黑猩猩与人类在600万年前曾享有一个共同的祖先，在经历短暂的进化后分道扬镳。

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Over evolutionary time, they lose unnecessary genes and become streamlined, ultimately leaving them with a tiny fraction of the genes they started out with: only the ones they really need.

在进化的时候，它们失去了不必要的基因，变得精简，最终留下了它们基因原始的一小部分：只有那些它们真正需要的。

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Creatures that live in the dark may lose their sight over evolutionary time.

凯伦·霍普金报道。 生活在黑暗环境下的生物可能在演化过程中视力逐渐下降。

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When exactly this happened is still unknown, as this kind of analysis does not show when in evolutionary time the retroposons were inserted.

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The evolutionary transition to full-time walking, which would have freed early humans' hands for using tools, clearly came later.

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"Because mutations start occurring at regular intervals in these genes as soon as a new species evolves - like the ticking of a clock - we can use them to trace the evolutionary history of a species back to its time of origin, " said Dr Hedges.

BBC: Earth AP