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← Nature & AnimalsWhich process occurs when freshwater fish enter seawater?
A)Excessive water loss via osmosis✓
B)Increased sodium ion reabsorption
C)Ammonia secretion is downregulated
D)Potassium actively transported into cells
💡 Explanation
Osmosis causes water to move from low to high solute concentration; because seawater is hypertonic relative to the fish's cells, the fish loses water by osmosis. Freshwater fish maintain internal ion concentration, therefore the fish dehydrates rather than gains needed electrolytes.
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