Multiple Choice
What permits the feather to "zip" and "unzip"?
A) The cohesive force of water molecules
B) Barbules and hooks
C) Oil from skin glands sticks the vanes together
D) Magnetic attraction due to charges built up from the feathers rubbing against each other
E) Bird saliva acting as a temporary glue
Correct Answer:
Verified
Correct Answer:
Verified
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