The primary function of the preen gland is _______.

Excretion

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Respiration

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Circulation

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Lubrication

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Solution

The correct option is D Lubrication
The preen gland, also known as the uropygial gland, is the only cutaneous gland in the body of the birds. These glands secrete lubricants that keep their feathers from drying out completely.

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