D. DNA fingerprinting show matches for identifying victims and criminals.
 
        
                    
             
        
        
        
Because science involves a lot of replication to confirm results. That means without the systems, it would take a long time to get the results right.
        
                    
             
        
        
        
Pavlov's dog stopped salivating to the bell when the food was no longer paired with the bell. This is called:
extinction