Which of the following statements regarding freshwater fish is true?
A. Freshwater fish frequently drink to obtain salt ions
B. Freshwater fish do not produce urine
C. Freshwater fish use their gills to actively take up salt ions
D. Freshwater fish lose water through their gills by osmosis
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Which of the following statements regarding saltwater fish is true?
A. The concentration of solutes in the internal fluids of saltwater fish is much lower than the surrounding water
B. Saltwater fish produce large amounts of diluted urine
C. Saltwater fish frequently dilute their body fluids
D. The concentration of solutes in the internal fluids of saltwater fish is higher than in the surrounding environment
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