Cell differentitation is important because our body's need different type of cells to grow and also function 
        
             
        
        
        
5% of $20 is $1; 5% off $20 is $19
        
             
        
        
        
Answer:
The movement of ions or molecules across a cell membrane into a region of higher concentration 
 
        
                    
             
        
        
        
The answer is "bb" because a gene must have alleles that are both recessive in order for the recessive trsit to take over.