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Nature & Animals

Which outcome impairs fish respiration in stagnant water?

A)Reduced concentration gradients across gills
B)Elevated water viscosity inhibits flow
C)Damaged gill filaments impede exchange
D)Increased active transport oxygen loading

💡 Explanation

Impaired gas exchange in the gills is caused by lack of fluid motion to maintain the concentration gradients; oxygen transfer via diffusion requires higher oxygen concentrations because, rather than continuous renewal, the stagnant surroundings reach equilibrium.

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