正如在生理特质上的进化学此消彼长一样，希尔斯说，在智力上也有此消彼长。

Just as there are evolutionary tradeoffs for physical traits, Hills says, there are tradeoffs for intelligence.

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一些乐观的人士将这种技术的繁荣比作是5亿年前寒武纪的大爆炸，当时地球上的进化在某种程度上呈爆发态势，因为细胞已经开始完善和正常化。

Some excited people have likened this technological upheaval to the Cambrian explosion 500m years ago, when evolution on Earth speeded up in part because the cell had been perfected and standardised.

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他们推断，虽然一些进化上的变化涉及基因的丢失，因此是不可逆转的，但其他的变化可能是基因被关闭的结果。

They reasoned that while some evolutionary changes involve the loss of genes and are therefore irreversible, others may be the result of genes being switched off.

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Hence, selfish genes will lead to altruistic animals because, to the extent that evolution operates at the level of the genes, there's no hard and fast distinction between your own body and someone else's body.

所以，自私基因会导致利他行为，从这个意义上说,进化在基因层面进行，你自己的身体和别人的身体,没有严格差别。

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