Question

I NEED HELP DUE IN 40 MINS! ONLY ONE QUESTION!
The fish species Astyanax mexicanus lives in caves deep underground off the coast of Mexico and cannot see.The fish has eyes, but as it develops in the egg, the eyes begin to degenerate, and the fish is born with an underdeveloped eye covered by a flap of skin.

1) The species A. mexicanus used to have functional eyes, but no longer has that ability. Why wasn't eyesight favored by natural selection.
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Answer 1

Answer:

Due to its habitat being dark caves eyes became something they no longer needed, Eyesight was no longer favored by natural selection because it was a useless thing now in those deep dark caves.

Explanation:

at least I presume this is the answer to this question.