Uhh, true. Not much context in the the question.
        
                    
             
        
        
        
A. has a decreased abiloty to fight off disease and poor growth
        
                    
             
        
        
        
The answer would be D. 30s (apex)
        
                    
             
        
        
        
Answer: The things that are listed .
Explanation: The circulatory system is made up of blood vessels that carry blood away from and towards the heart :  Arteries carry blood away from the heart and veins carry blood back to the heart .