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Which advantage arises when birds use slotted feathers under turbulent conditions?

A)Delayed stall via boundary layer energizing
B)Improved lift during slower airspeed
C)Reduced surface tension from micro-riblets
D)Increased alula effectiveness for maneuverability

💡 Explanation

Slotted feathers energize the boundary layer via momentum transfer because separated plumes add kinetic energy to slow-moving air, therefore stall is delayed rather than inducing early turbulence; lift depends on airfoil and airspeed rather than slotting.

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