What is the main purpose of using the combining form in medical terminology?

the maintenance of fluid balance during exercise. author information: fluid supplementation is necessary for exercise in which fluid losses must be offset by intake to avoid the negative effects of hypohydration on health and performance.

d is the answer hope this

9, 5, 10000000 ( that is supposed to be a ten for the last one)

its bassicly asking u   to answer it in your own words does that