Afailure of the red-sensitive nerves in the eye to respond to light properly causes
a. color blindness.
b. chromatic aberration.
c. farsightedness.
d. astigmatism.

The correct answer is A. Color blindness.

This causes the eye not only to be unable to see the Red color, but also the Green color, which leads to color blindness in people.

The answer is letter A.

Color blindness is a condition in which the red-sensitive nerves in the eye fail to respond to light properly. This condition is also known as color vision deficiency. It affects a significant percentage of the population of the world. Blindness does not literally translate to an actual blindness but rather refers to just a deficiency of color vision. People who have this condition usually obtained or took this trait directly from their parents through genetic codes embedded within the cells during reproduction.

Na+ loss through sweet plus the dilution has lowered na+ concentration outside of neurons, altering the na+ equilibrium potential. sodium exists more outside the cells than inside. when na+ is lost by sweat plus the dilution( because they drink a lot of water) changes the concentration outside the cell, forcing the water to enter the cell and attempt to balance the concentration inside/outside.the problem is that the abundance of water will cause the cells to swell. most cells can adapt, however, the brain cells can't that's why the runner has confusion and can't control the muscles.  if not treated and this occurs in less than 48 hours, it can be immediately fatal .