Answer the following:
a. What is a ball and socket joint?
b. Which of the skull bones are movable?
c. Why can our elbow not move backwards?
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Answer: a) A ball and socket joint is a type of joint which can move in all directions.
b) The lower jaw is the only movable joint.
c) Because it is a hinge joint and a hinge joint can only move in a particular direction.
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