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← Nature & AnimalsWhich risk to soaring performance escalates when structural feather barbules degrade?
A)Increased boundary layer turbulence drag✓
B)Decreased wing surface area lift
C)Heightened hemoglobin oxygen saturation
D)Reduced metabolic reserve for shivering
💡 Explanation
Increased turbulence occurs with barbule degradation. Impaired barbule interlocking reduces airfoil smoothness via increased flow separation. Because of reduced lift generation and soaring efficiency, the bird must expend more energy, rather than maintaining controlled flight because of increased structural integrity.
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