Answer:
A - controlling ACID-base balance.
W - controlling WATER balance.
E - maintaining ELECTROLYTE balance.
T - removing TOXINS and waste products from the body.
B - controlling BLOOD PRESSURE.
E - producing the hormone ERYTHROPOIETIN.
D - activating vitamin D.
Explanation:
D, this is true because it does not state how many heartbeats you multiply by and there is defenitly no multiplying anyway