There are two classes of membrane transport proteins—carriers<span> and </span>channels<span>. Both form continuous </span>protein<span> pathways across the lipid bilayer. Whereas transport by </span>carriers<span> can be either active or passive, solute flow through </span>channel proteins<span> is always passive.</span>
        
                    
             
        
        
        
Answer:
the best one is to wash your hands. you can also not touch your face as much. this will help stop the spread of germs. 
 
        
             
        
        
        
Catabolism (a form of metabolism in which cells are breaking down larger units into smaller units). 
Another answer is cellular respiration