Answer:The excretory system is a close partner with both the circulatory and endocrine system. The circulatory system connection is obvious. Blood that circulates through the body passes through one of the two kidneys. Urea, uric acid, and water are removed from the blood and most of the water is put back into the system.
Explanation:
 
        
             
        
        
        
Ecosystem and pond, 
not sure though but good luck !
        
             
        
        
        
Is there a picture or do you want me to explain
        
                    
             
        
        
        
To thank of the posabillatis