Answer:
The body's homeostatic control mechanisms ensure that a balance between fluid gain and fluid loss is maintained.
Explanation:
A) For it does not require a life long commitment, and it is not C) because it can be any substance not just tobacco!
Thus your answer is A) gradually but completely withdrawing substances from use !
Have a happy life !
:D <span />
both are true :) bmi cannot tell the difference between fat and muscle because it is based off your height and weight only