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← Nature & AnimalsWhich effect results when migratory birds extensively use thermal lift?
A)Decreased energy expenditure during soaring✓
B)Increased dependence on powered flapping
C)Enhanced feather wear and degradation
D)Elevated risk of mid-air collisions
💡 Explanation
Thermal lift causes decreased energy expenditure because soaring flight allows conservation via minimized flapping, rather than increased flapping; barbs & barbules on lightweight feathers leverage lift & control; therefore lower muscle actuation, rather than excess feather degration under aerodynamic forces because no more flapping, during high-altitude ascent.
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