The main buffer system of the human blood is____________?
A. CH<sub>3</sub>COOH CH<sub>3</sub>COO<sup></sup>
B. NH<sub>2</sub>CONH<sub>2</sub> NH<sub>2</sub>CONH<sup>+</sup>
C. H2CO3 HCO3
D. H<sub>2</sub>CO<sub>3</sub> CO<sub>3</sub><sup>2-</sup>
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