Posted by admin | Posted in Herbal Remedies | Posted on 31-08-2010
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How come natural selection might have resulted in cave-dwelling amimals with extra-large antennae and no eyes?
I understand about cave-dwelling animals having extra-large antennae because it would give them an advantage over animals with smaller antennae which would have more chance of being eaten but I don't understand about the no eye thing. Having eyes would not give the animal a disadvantage or cause it to die or be eaten. The eyes would just be redundant because it would be too dark for them to see. Does anyone know why selection causes these animals not to have eyes? Thanks
Lots of traits are a "use it or lose" it proposition. Without use, or an advantage gained by using, some traits recede over time. Bodies respond to the needs of their environment, so mutations that favor advantageous traits are the ones that the body's resources are geared towards maintaining or improving. That may be why humans still have a tail bone, but no tail. Maybe even the tail bone will disappear in a few millenia if we make it that far. That said, the creatures you are describing may still have vestigial (remnants of) eye spots, and probably still have optic nerves, even though there's no input, depending upon what species they evolved from.
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