It’s a term for molecules present in organisms that are essential to one or more typically biological processes, e.g. cell division.
        
             
        
        
        
Answer:
The answer is B
Explanation:
Negative feedback mechanisms work to prevent sudden severe changes within the body.
Negative feedback helps in the maintenance of body parameters within their normal range thus prevent change within the body. 
 
        
             
        
        
        
Answer:
pituitary gland
Prostaglandins 
oestrogen and testosterone
Explanation:
The pituitary gland plays an important role in puberty. Puberty refers to the time in which a boy or girl sexually mature. Many cells produce chemicals called Prostaglandins hormone which impact inflammation and oestrogen and testosterone are the hormones which is responsible for the maturation of eggs in female and sperm in male. these hormones plays a vital role in the growth and development of human body.