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← Nature & AnimalsWhich outcome decreases when a hummingbird experiences localized blockage in its air sacs?
A)Oxygen flow to flight muscles✓
B)Evaporative cooling during exertion
C)Efficient voice-box sound projection
D)Buoyancy during short flight bursts
💡 Explanation
When air sacs are blocked, convective oxygen transport is impaired because fewer air sacs means lower available pulmonary volume, reducing the flow of oxygen to flight muscles, vital for metabolism. Therefore oxygen flow decreases, rather than cooling, sound projection, or buoyancy, processes depending on other physiological mechanisms.
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