Answer:
C.
pump blood, which carries nutrients and oxygen to the cells of the body.
 
        
             
        
        
        
Please provide more information in your question
        
                    
             
        
        
        
B) population because there is more than one in one species and types
        
                    
             
        
        
        
In order to see precise cells, living cells are better to observe to get the correct information while dead cells do not do anything and you can't really get information out of it