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Which of the following is true about pre...

Which of the following is true about preen gland? Occur in birds, 2. Also known as upropygial galnd 3. Occur in bats. 4. Help in digestion

A

1,2, and 3

B

1 and 2

C

2 and 4

D

1 and 3

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MODERN PUBLICATION-ANIMAL KINGDOM-EXAMPLE
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  11. What are the modifications that are observed in birds that help them f...

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