(D) The vertebrae of birds are mostly $Heterocoelous$. In $Heterocoelous$ vertebrae,the articular surfaces of the centrum are saddle-shaped,which allo

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(D) The vertebrae of birds are mostly $Heterocoelous$. In $Heterocoelous$ vertebrae,the articular surfaces of the centrum are saddle-shaped,which allows for extensive movement of the neck while preventing rotation,providing stability and flexibility required for flight and feeding.