Complex structures and behaviour such as eyes and language are undoubtedly the product of natural selection.
复杂的结构和行为，例如眼睛和语言毋庸置疑是自然选择的产物。
As long as the forces of selection stay constant, natural selection canpush evolution in one direction and produce sophisticated structures insurprisingly short times.
只要选择的影响力存在，自然选择就能把进化向一个方向推进，在出乎意料的短时间内产生复杂的结构。
These abnormal limbsare not functional, but their existence demonstrates that geneticmistakes can produce complex structures, which natural selection canthen test for possible uses.
这样长出来的肢体没有实际作用，但它能够证实，基因变异能产生复杂的结构，自然选择能够测试这些结构的可能用途。
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