Most hormone feed back is a negative feed back mechansm, A feed back mechanism is a form of a signal mechanism loop where product feed back to control its own production.
Explanation:
For example pancreas is an important gland in an endocrine system which relies on negative feed back to regulate blood glucose level in the body to keep it within the required healthy range.
<span>D is the correct answer. Want is the most abstract choice here that can be perceived or sensed. Jogging, laughing and punching are all more physical actions.</span>
