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Which outcome results to raptor flight during sustained soaring?

A)Reduced metabolic rate decreases efficiently
B)Increased air sac ventilation augments
C)Turbulence increases drag substantially then
D)Feather barbule angles realign randomly

💡 Explanation

During sustained soaring, reduced metabolic rate permits energy conservation via thermals, because birds optimize energy use using their wing profile effectively; therefore, decreased need for flapping occurs, rather than increased activity because air resistance inhibits active respiration.

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