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Which of the following statements is true about buffer solutions?
A) They maintain a constant pH when bases are added to them but not when acids are added tothem.
B) They maintain a constant pH when acids are added to them but not when bases are added tothem.
C) They maintain a constant pH of exactly 7 in all living cells and biological fluids.
D) They maintain a relatively constant pH when either acids or bases are added to them.
E)They are found only in living systems and biological fluids
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