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← Nature & AnimalsWhich outcome results when growing flight feathers encounter insufficient blood supply?
A)Increased alula feather flexibility
B)Formation of stress bars (fault bars)✓
C)Enhanced flight maneuver dynamic stability
D)Improved feather thermoregulation in soaring
💡 Explanation
Stress bars form due to interrupted keratin deposition via protein production during feather growth because a rapid supply is critical, therefore visible fault bars appear due to malformed feather structure rather than increased feather flexibility.
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