Which process allows marine birds drinking seawater to avoid osmotic imbalance?

💡 Explanation

When marine birds drink seawater, active chloride cell excretion in gills actively transports excess salt out of the blood, maintaining a lower internal salt concentration and preventing dehydration via osmosis because of chloride gradients. Therefore, excessive chloride is transported by chloride cells down gradients so that osmotic imbalance is prevented, rather than sodium tolerance, metabolic compensation, or kidney filtration, which are less efficient mechanisms for high salt loads.

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