the route of administration that may result in limited absorption of medications because of the characteristics of the local environment into which they are introduced.

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.

d, i believe because of it's activity level

because health skills are tools and strategies and also practical skills are also something you need to learn (like tools and strategies) and put it in reality.