Digestion, medulla, heart, and involuntary muscles
        
             
        
        
        
Cellulose is found in the cell walls of plant cells. It is permable so any substance disolveabls in water can pass through so it dose not act as a barrier. It gives the cell its strength and support. As water moves in to the cell by osmosis it stops the cell from bursting.
        
             
        
        
        
Answer:
regression of bacteria numbers 
Explanation:
because it could have became infected
 
        
                    
             
        
        
        
Compressed is the first blank and older is the second one