Why only the lower jaw is movable??? 

Dear Student,

The skull or the cranium is composed of fixed joints that are immovable. The lower jaw or the mandile is attached to the skull by a hinge joint that makes it the only movable part of the skull.

Hope this answers your question,

Best wishes!!

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the skull has an immovable joint.the upper jaw is attached to the skull.that is why the upper jaw cannot be moved

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