C) a system is a set of parts that function together as a whole
 
        
             
        
        
        
Answer:
taste and smell 
Explanation:
triggers taste 
example
hold your nose put a fruit candy in your mouth you will notice there will be a slight different taste
these molecules trigger basic taste
 
        
             
        
        
        
Emperor penguins need lungs to breathe. In penguin lungs, air never stops. ... Once the air goes farther into the trachea it splits into two different directions into both lungs. To get the oxygen into the blood cells, it must come "within small distance of the penguin blood cells".