Read the following statement and choose the c | vedclass

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(D) The skin of $Aves$ is dry and devoid of glands,except for the oil gland (preen gland) located at the base of the tail,which is used for the lubric

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Preen gland is present at the base of tail.

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(D) The skin of $Aves$ is dry and devoid of glands,except for the oil gland (preen gland) located at the base of the tail,which is used for the lubrication of feathers.Air sacs in $Aves$ are connected to the lungs and assist in respiration,not excretion.Excretion in $Aves$ is performed by the kidneys.The heart of birds is completely four-chambered,consisting of two atria and two ventricles.

Read the following statement and choose the correct characteristic feature of $Aves$.

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