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What body part has a joint that works in a manner similar to a door?
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I think a knee and an elbow, because they only have on direction of motion
The Knee most likely. Both can only move in two directions. All the other ones can go in other directions.
The knee, although the elbow can make the same movement it isn't limited to just that one moment in a natural situation.
Natural meaning not broken or pulled whatnot.
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