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Nature & Animals

Which 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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