Bone marrow is absent in

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(C) The bones of birds,such as the ostrich and owl,are hollow and are known as pneumatic bones,meaning bone marrow is absent in them.This is a special

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Aves

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(C) The bones of birds,such as the ostrich and owl,are hollow and are known as pneumatic bones,meaning bone marrow is absent in them.This is a specialized adaptation for the aerial life of birds,which reduces their body weight to facilitate flight.

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