Identify the odd one and justify.
(B) Sweat gland, Sebaceous gland, Preen gland, Mammary gland.

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Solution

Odd one is : Preen gland.
$∙$ The preen gland is the characteristic feature of the birds.
$∙$ These glands are responsible for providing lubrication to feathers.
$∙$ It is located dorsally at the base of the tail. It helps in maintaining the integrity of the feather structure.
$∙$ The other glands are present in different animals also including birds.
So, preen glands are different from others.

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