No matter how much water a human drinks, the kidneys are always regulating various aspects of the blood, including ________.IThe pH of the bloodIIThe plasma concentration of iron ionsIIIThe plasma concentration of sodium ionsIVThe plasma concentration of potassium ionsVThe temperature of the blood
A. I, II, III, and IV
B. I, II, III, IV, and V
C. I, II, and III
D. I, III, IV, and V
E. I, III, and IV
Answer: E
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