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← Nature & AnimalsWhich risk increases when gills of fish experience high sediment concentration?
A)Reduced oxygen uptake efficiency✓
B)Increased metabolic rate for osmoregulation
C)Elevated risk of parasitic infection
D)Enhanced countercurrent exchange effectiveness
💡 Explanation
When gills encounter high sediment, diffusion pathway obstruction occurs because sediment particles physically block the gill lamellae, reducing surface area available for gas exchange, decreasing oxygen uptake. Therefore reduced oxygen uptake efficiency results, rather than increased osmoregulation, or parasitic rates, because these respond to different triggers.
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