Mental health disorders are
a.
easily cured with medications
b.
not really classified as diseases
c.
complex diseases
d.
caused by birth defects

i think your answer is c. measurement system in which the medication dosage was calculated.

fluid balance is an aspect of the homeostasis of organisms in which the amount of water in the organism needs to be controlled, via osmoregulation and behavior, such that the concentrations of electrolytes (salts in solution) in the various body fluids are kept within healthy ranges. the core principle of fluid balance is that the amount of water lost from the body must equal the amount of water taken in.