What Permits the Feather to "Zip" and "Unzip

question 71

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

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Definitions:

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