It would be an antioxidant, and the most commonly used antioxidant would be absorbic acid.<span />
The correct answer among the choices provided is option A. Lung capillaries are responsible for exchanging carbon dioxide for oxygen from the air. Blood that comes from the heart gets oxygen from the alveoli. The carbon dioxide in the blood goes into the alveoli at the same time.
all d before I go this answer
b)1 unicellular- means one cell