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← Nature & AnimalsWhich structural change results when air sacs rupture in bird wings?
A)Decreased lift coefficient✓
B)Enhanced thermal conductivity
C)Greater buoyancy in water
D)Increased bone density
💡 Explanation
A rupture prevents proper wing inflation, inhibiting airflow attachment to the wing. This is because the mechanism of ‘Boundary Layer Transition Control’ requires stable air pressure; therefore, lift is reduced, rather than enhanced buoyancy, due to air loss.
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