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← Nature & AnimalsWhich outcome occurs when avian thermoregulation fails during soaring at high altitudes?
A)Localized feather delamination risks increased drag
B)Decreased air sac performance affects oxygenation✓
C)Muscle shivering promotes sustained endothermy
D)Cutaneous vasodilation improves radiative cooling
💡 Explanation
Hypoxia increases due to reduced air density; impaired thermoregulation affects air sac performance because ventilation depends on stable temperatures, therefore decreased oxygen uptake results rather than muscle shivering increasing thermogenesis. The birds' air sacs become less efficient in higher altitudes.
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