cavefish

1.Studies revealed that eye loss evolved independently at least three times among the cavefish;

研究显示，在不同品种的洞穴，失视力的演化过程是独立的，而且至少发生了次。

2.At least some of the mutations responsible for this loss of vision differed between the 29 populations of cavefish known to exist.

目前现存的29种洞穴，其眼盲亦与这些突变有，是其基因突变的位置并不相同。