Answer:
You can improve it by decreasing body fat, increasing muscle or both. 
Explanation:
 Any of these changes will lead to a decrease in your body fat percentage, which is viewed as a single number that describes your body composition. Most people know that diet and exercise can affect body weight and body composition.
 
        
                    
             
        
        
        
Stress can effact youu digestive system by causing your esophagus to go into spasms. Increasing the acid in your stomach, which results in indigestion, making you feel nauseous.
 
        
                    
             
        
        
        
Its between C and D for me.But I think D is the answer.
        
             
        
        
        
There are many different systems involved in when we exercise, the three main ones are the Respiratory system which is involved in breathing the circulatory system which is about circulation of blood around the body and finally the muscular system and finally the Muscular system which is about how we move.
Explanation:
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