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← Nature & AnimalsWhich mechanism causes increased efficiency when fish gills receive warmer water?
A)Increased membrane diffusion gradient✓
B)Elevated metabolic oxygen demand
C)Enhanced gas solubility threshold
D)Reduced hemoglobin oxygen affinity
💡 Explanation
Increased temperature results in better gas molecule diffusion due to a heightened energy state; this boosts the efficiency of countercurrent exchange because the molecules are faster. Therefore, the membrane diffusion gradient increases in fish; rather than hemoglobin binding or gas solubility increases.
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