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In avian powered flight, which outcome inhibits stall when birds experience sharp gusts?

A)Alula reduces boundary layer separation
B)Increased hemoglobin carries additional oxygen
C)Reduced feather barb stiffness increases form
D)Higher bone density resists torsion better

💡 Explanation

Upward gusts increase the effective angle of attack; the alula creates a slot that energizes the boundary layer air using the mechanism of boundary layer control. This prevents stall because it delays separation, therefore maintaining lift in turbulent conditions rather than experiencing abrupt loss.

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