Bones function as levers for the muscles to provide movement of the body what refers to reducing the angle of the joint thus bringing two bones closer together

The answer is D: Flexion.

Flexors muscles of the cause’s flexion, which reduces the angle of the joint and reduces the dis-tance between two bones. In this process, the muscle contracts and this brings the bones attached to the muscle close to each other due to the movement of the nearby joint. For example when flexion occurs at the elbow, the bones “Ulna” and “ Humerus” get close to each other .  

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