而使个体更好适应环境的变异将让这些个体有更多的后代。
Variations that made individuals better adapted to their environment would let them have more offspring.
我们祖先的一个基因变异使得他们的后代拥有能够容纳更大的大脑的头骨。
A genetic mutation in our recent ancestors caused their descendants to have roomy skulls that accommodated larger brains.
首先是三种变异个体类似地成群，这表明它们是同一祖先的后代。
The first was that the three variables clustered similarly, suggesting that they were accurate markers of ancestry.
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