The answer to the question stated above is pH Balance. It is letter a.
Acidosis and alkalosis can occur when the excretory system fails to keep a functional: pH Balance.
When the pH value of body fluids is below 7.35, the condition is called acidosis, and when the pH is above 7.45, it is called alkalosis.
The choices to the question given are the following:
a. PH balance.
b. Skin temperature.
c. O2-to-CO2 ratio.
d. Circulation rate.