东南亚一群居住在海里的人已经进化成了更好的潜水员。

A group of sea dwelling people in Southeast Asia have evolved into better divers.

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当然，某一物种或某一群物种的进化不一定增加其复杂性。

Definitely. Evolution within a species or family of species does not have to increase in complexity.

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所谓平行进化是指两群彼此没有联系的动物进化出相似的特征。

Parallel evolution is when two groups of animals evolve similar features without being related to one another.

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