First-class levers ________.
a) are typified by tweezers or forceps
b) in the body can operate at a mechanical advantage or mechanical disadvantage, depending on specific location
c) are the type found in the joints forming the ball of the foot as used in raising the body on the toes
d) have load at one end of the lever, fulcrum at the other, and effort applied somewhere in the middle
First-class levers ________.
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b) in the body can operate at a mechanical advantage or mechanical disadvantage, depending on specific location