We've inherited all of our biology from mammals, we've just added extra things through evolutionary time.

他说：“我们继承了哺乳动物的所有生理特征，并在漫长的进化过程中，添加了一些新的特征元素。”

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Evolutionary time, in which 6,895 days represent a mere.000000005% of the 3.5 billion year history of life on Earth.

演变着的时间——6895天仅仅相当于地球35亿年历史的0.00000005%。

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Creatures that live in the dark may lose their sight over evolutionary time. They may even lose their eyes entirely.

在黑暗中生活的动物可能会在进化过程中失去视力，甚至可能一点东西都看不见。

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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.

BBC: Australia's marsupials 'have American roots'

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

ECONOMIST: An ancient child has been discovered

"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