Which biomechanical advantage results when an avian's air sacs increase lung ventilation while soaring?

💡 Explanation

When air sacs enhance ventilation, countercurrent exchange becomes significantly more efficient because they promote a unidirectional flow of air, maximizing oxygen uptake even at high altitudes with low oxygen partial pressures. Therefore enhanced oxygen extraction results, rather than drag reduction, increased lift, or minimizing heat loss, which involve distinct mechanisms.

• Which aerodynamic consequence occurs when raptor flight feathers experience excessive wear?
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