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← Nature & AnimalsWhich increased metabolic demand occurs when fish maintain osmoregulation?
A)Increased ion transport activity✓
B)Reduced gill surface tension
C)Enhanced gas diffusion gradient
D)Decreased kidney filtration rate
💡 Explanation
Increased ion transport directly increases fish metabolic needs because active transport requires energy to pump ions against their concentration gradients in osmoregulation rather than letting them diffuse freely; therefore, active transport is used rather than passive because needed blood concentrations might vary.
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