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← Nature & AnimalsWhich influence on lift occurs as wingtip vortices intensify during bird flight?
A)Induced drag increases disproportionately✓
B)Thrust progressively balances lift
C)Angle of attack uniformly decreases
D)Span loading consistently minimizes stall
💡 Explanation
Increased wingtip vortices lead to greater downwash through induced drag, which is generated by adverse pressure gradient as air spills around the wingtips because aerodynamic lift is affected by these vortices. Therefore, induced drag increases disproportionately, rather than any change in thrust or stalled minimal span loading.
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