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What is a rigid bar pivoted about a fulcrum?

  1. Latex

  2. Larva

  3. Lever

  4. Larynx

The correct answer is: Lever

A lever should be the answer because it fits the description of a rigid bar that is pivoted about a fulcrum. A fulcrum is a fixed point that a lever rotates around. The other options, latex, larva, and larynx, do not fit the description of a rigid bar pivoted about a fulcrum. Latex is a type of material, larva is a stage in an animal's life cycle, and larynx is an organ in the throat. These options are not related to the concept of a lever and fulcrum.