Answer:
they are so for..
both of them are comprised of similar tissues working together to perform a particular task.
 
        
                    
             
        
        
        
So A matches with U and C matches
With G. If you need more
Help then go to comments
        
             
        
        
        
Carbon and hydrogen. 
The simplest group of organic molecules are the alkanes which have only these 2 elements. Eg methane, CH4.