Bone marrow does not occur in

Fishes

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Amphibians

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Birds

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Reptiles

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Solution

The correct option is D Birds
Birds have pneumatic bones which is hollow and devoid of bone marrow. Pneumatic bone make the body of animal light and buoyant which is essential for flight. Bone marrow is mainly present in mammals, bony fishes, amphibians and reptiles. Thus, the correct answer is option C.

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