Why does range of motion need to be measured separately for each joint? A. The average ranges of motion of joints are not known. B. Each joint has a different range of motion. C. Range of motion can change rapidly in a joint. D. none of the above

B. Each joint has a different range of motion.

Explanation:
The range of motion for each joint needs to be measured separately as each joint has a different range of motion depending on the type and placement of the joint, for instance ball and socket joints have more movement than a hinge joint.

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