The relationship between the two is that ETC allows cytochrome to pass into it's final acceptor oxygen.
 
        
             
        
        
        
 h20 hydrogen times 2 and 1 oxygen ;)
 
        
             
        
        
        
Enzymes are biological molecules (typically proteins) that significantly speed up the rate of virtually all of the chemical reactions that take place within cells.
        
             
        
        
        
science can impact our lives with energy we use lots of it and yes I would choose a career in science because you can learn a lot from science like about the vaccines that are out etc basically this part is your opinion