<span>C. obtain and use energy. </span>
        
                    
             
        
        
        
C, if you look at a water wheel, water flows on the wheel, turning a rod, powering something on the inside. Dams do the same thing except the rod goes into a transformer and is more complicated.
        
                    
             
        
        
        
Biology helping with medical research and treatment
        
             
        
        
        
The answer to the question is B