这些返祖性状提供了优势，并在种群中传播，有效地逆转了进化。
These atavistic traits provided an advantage and spread through the population, effectively reversing evolution.
尽管第一个长出木本的植物体积很小，但接下来的其他植物种群便能够因此迅速从木本结构优势种获利，仅仅几百万年的时间，其中一些具有木本的植物便进化得像现在的树一样了。
Although the first plants sporting wood were small, subsequent species quickly took advantage of wood's structural strength: in just a few million years, some had attained treelike stature.
有生长优势的细胞能迅速繁殖，成为优势种群。但是，这通常是由基因突变引起，并不是我们所期望的正常生长。
Cells with a growth advantage expand faster and dominate. However, this can come at the price of genetic mutation, so growing fast is not always desirable.
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