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2. The jaw would be the hardest. You cant chew so you cant swallow. If you cant swallow you cant eat, if you cant eat you cant live. There are loop holes but I don't think theirs enough loop holes to stop that.
3. Eating, breathing out your mouth, and talking. Basically all the things you need to live.
4.I would choose the knuckles. You can almost do everything that you can do with them.
5. The motion of breaking them. They move without using joints. The little shards of bone move.