Which of the following statements is true? Incandescent light bulbs are almost 100 percent efficient.
Endothermic reactions release heat.
Heat is considered "lost" energy because it cannot be used for work.
An electric drill gains energy in the form of heat and sound.

I know i'm late but here the answer Heat is considered "lost" energy because it cannot be used for work.

Explanation:

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.