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Biology 11 Online
OpenStudy (anonymous):

What body part has a joint that works in a manner similar to a door?

OpenStudy (anonymous):

I think a knee and an elbow, because they only have on direction of motion

OpenStudy (anonymous):

The Knee most likely. Both can only move in two directions. All the other ones can go in other directions.

OpenStudy (anonymous):

The knee, although the elbow can make the same movement it isn't limited to just that one moment in a natural situation.

OpenStudy (anonymous):

Natural meaning not broken or pulled whatnot.

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