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The mandible acts as a class ____ lever.
1
2
3
4
The correct answer is: 3
The mandible is a class III lever, as it has a fulcrum (jaw joint) between the effort (muscle) and load (teeth). Option A is incorrect because class I levers have the fulcrum in between the effort and load. Option B is also incorrect because class II levers have the load in between the fulcrum and effort. Option D is incorrect because class IV levers have the effort in between the fulcrum and load. Therefore, the correct answer is C, class III lever.