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← Nature & AnimalsWhich outcome occurs when a bird experiences increased feather barbule spacing?
A)Reduced flight lift and increased drag✓
B)Enhanced thermal regulation via piloerection
C)Improved underwater diving pressure resistance
D)Increased UV radiation resistance within plumage
💡 Explanation
Increased barbule spacing impairs feather interlocking, disrupting airfoil surfaces. This results in increased drag through increased air turbulence, as well as reduced lift through decreased pressure difference. Therefore, lift decreases and drag increases, rather than enhanced regulation because feather density governs aerodynamic properties.
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