Question

when energy is put into a system, some of that energy is lost as what?
energy is never lost
heat, sound, and light

Explanation:

The law of conservation of energy states energy cannot be created or destroyed, but it can be converted to less useful forms in a system. When energy is input to a system, usable energy is often dissipated into non-useful, dispersed forms like heat, sound, and light. The option "energy is never lost" is a true general principle but does not answer the question asking what form the unusable energy takes when it leaves the system's usable pool.

Answer:

heat, sound, and light