Which limitation affects gas exchange when a fish's lamellar structure degrades, reducing countercurrent efficiency?

💡 Explanation

If lamellar structure degrades, the countercurrent exchange mechanism's efficiency decreases because this structure maximizes oxygen extraction from water flowing past gills. Therefore, decreased oxygen absorption results, rather than CO2 accumulation, ammonia changes, or pressure which are linked to different transport mechanisms.

• Which outcome occurs when C4 plants experience high nitrogen limitation?
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