They possess an endoskeleton characterized by | vedclass

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(D) The presence of porous and hollow bones,known as $pneumatic$ bones,is a characteristic feature of the class $Aves$ (birds). These bones reduce the

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Aves (Birds)

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(D) The presence of porous and hollow bones,known as $pneumatic$ bones,is a characteristic feature of the class $Aves$ (birds). These bones reduce the body weight of the bird,which is an essential adaptation for flight. Other classes like $Mammalia$,$Amphibia$,and $Pisces$ (fishes) do not typically possess pneumatic bones as a primary skeletal feature.

They possess an endoskeleton characterized by porous and hollow bones.

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