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← Nature & AnimalsWhich outcome during thermal soaring occurs when a vulture's alula stalls?
A)Momentum increases in vertical columns
B)Lift abruptly decreases on feathers✓
C)Drag decreases with minimal friction
D)Air sacs become less effective
💡 Explanation
Vultures use thermal columns to soar; stalling the alula triggers boundary layer separation, decreasing lift because airflow cannot effectively adhere to the wing's upper surface. Therefore, lift is acutely lost, rather than augmented. Enhanced drag is expected.
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