For breaking down lactose
 
        
             
        
        
        
Answer:
<h2> I don't know but my Answer is </h2><h3>from different environments ,each structure suits their environment better than the other's</h3>
 
        
             
        
        
        
The tree would contain carbon.
        
                    
             
        
        
        
Oxygen is extremely electronegative, making it very powerful in pulling electrons down the electron transport chain. Occurs in the cytosol. Glycolysis begins cellular respiration by breaking glucose into two molecules of a three-carbon compound called pyruvate. 2 ATP produced.