So that they don't explode. 
AKA with a thing called osmosis (transportation of water through cells.)
 
        
                    
             
        
        
        
Ionic bond is a compound made up of a meta and a non-metal eg NaCl (sodium chloride)
covalent bond is made up of two non-metals eg H2O (water)
        
             
        
        
        
A little bit less than a purposely discovery. A discovery that you've been looking for for a while would be like 75% of discovering but accidentally would be 35% of actually discovering something accidentally.
        
                    
             
        
        
        
Answer:
the shape of white blood cells
 
        
                    
             
        
        
        
Answer:
B
Explanation:
your answer is chlorophyll 100% positive