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← Nature & AnimalsWhich wing adaption results when a migratory bird experiences turbulence?
A)Alula feathers create stall recovery✓
B)Asymmetric vortex generation limits drag
C)Reduced aspect ratio increases lift
D)Boundary layer separation ensures thrust
💡 Explanation
Unstable airflow activates the alula feathers; this modifies airflow above the wings using vortex generation, therefore recovering from stall conditions, because the induced vortex re-energizes the boundary layer, rather than directly increasing lift alone, or providing thrust.
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