/u/einharjar009's posts in /r/askscience
It is seen with certain cave-dwelling species like salamanders, lizards, and even mammals that evolved to have blindness due to the lack of light in the environment. Why do fish on the deep ocean floor still have functioning eyes when their environment has no light to begin with?
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Why don't other Great Ape'ssc (or any other mammal's) hair grow long like ours does? Is there some limiter?
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