Question

We can move our arms in circular motion but not your knees. Why?
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Answer 1

Answer:

due to the structure

Explanation:

the structure of knees are different

Answer 2

Answer:

We can move our arms in circular motion but not our elbow because the joints at the elbow are the ball and the socket joint whereas the joints that are present in our elbow is the hinge joint. The ball and the socket joints can be rotated to 360 degree.