Which effect impedes a bird's flight when air sac obstruction prevents efficient air flow?

💡 Explanation

When air sac obstruction occurs, it impairs efficient air flow, reducing the oxygen supply to flight muscles during intense activity, which inhibits proper wing muscle function, reducing their ability to generate lift. Therefore, reduced lift from diminished circulation results, rather than decreased drag, thrust, or improved maneuverability, which depend on unobstructed airflow and normal muscle function.

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