Which object would be used to turn a lever?

The correct answer is a fulcrum. A fulcrum is the pivotal point around which a lever rotates. In a lever system, the fulcrum is the support that provides the leverage for the lever arm to operate effectively. When force is applied to one side of the lever, the fulcrum allows the lever to move and transmit that force to the other side, enabling the lifting or moving of objects.

The other options do not apply in the context of turning a lever; gas does not provide the mechanical interaction needed, a function refers to a relationship or role, and fungi are organisms that do not have a direct role in the mechanics of levers. Understanding the role of the fulcrum is fundamental in studying levers and their applications in mechanical systems.