Which risk increases when aquatic organisms with countercurrent exchange face higher water temperatures?

💡 Explanation

When water temperature rises, oxygen solubility decreases, thus convection and countercurrent exchange becomes less efficient because the diffusion gradient declines, reducing arterial oxygen saturation. Therefore, oxygen uptake decreases, rather than other processes like waste excretion, parasite defenses, or ventilation adaptations related to CO2 that operate independently.

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