All of the above u believe
There are not answer choices?
They help to prevent the disease from occurring. The immune system becomes familiar with the pathogen and learns how to fight it. Its the same process with vaccines
Answer:
c. carbonic anhydrase
Explanation:
Carbonic anhydrase is active in red blood cells converting carbon dioxide into carbonic acid and bicarbonate ions. In the lungs it converts bicarbonate ions to carbon dioxide where it is exhaled.