The correct answer should be B. CARBOHYDRATES
        
             
        
        
        
AO, BO. cause thats makes it where the childern can have all blood types 
        
             
        
        
        
Answer:
The main role of carbonic anhydrase in humans is to catalyze the conversion of carbon dioxide to carbonic acid and back again. However, it can also help with CO2 transport in the blood which in turn helps respiration. It can even function in the formation of hydrochloric acid by the stomach.
Explanation:
 
        
             
        
        
        
Living things obtain and use energy so alive?