_ fish do not drink water.
Correct answer: B. Freshwater fish
- A. Marine fish
- B. Freshwater fish
- C. Both
- D. None
Explanation
Freshwater fish do not drink water because they are surrounded by an environment where the water has lower salinity than their bodily fluids. As a result, water naturally flows into their bodies through osmosis. To maintain osmotic balance, they excrete a large amount of diluted urine. On the other hand, marine fish live in high-salinity environments and must drink seawater to replace lost fluids and maintain osmotic balance. They excrete the excess salts through specialized cells. Therefore, the correct answer is that freshwater fish do not drink water.
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About Homeostasis
Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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