Answer:
B
Explanation:
I would say this because the pulmonary circulation only transports deoxygenated blood. And this blood gets transported to the lungs so the lungs can absorb oxygen and release carbon dioxide. I am not sure about this one though. This is what I think.
Ans : C - enzymatic action on carbohydrates ( enzyme amylase catalyses carbohydrate to maltose here in the mouth )