Q: Answer the question

The human skin plays an important role in a variety of organ systems. Which organ system is least likely to have a direct interaction with the skin?
OPTIONS:
- digestive
- excretory
- immune
- nervous

A: digestive

Q: Answer the question

Where does the energy from an earthquake originate?
OPTIONS:
- from a sudden increase in solar radiation striking Earth
- from the Moon's gravitational pull during a close orbit
- from rocks under stress shifting deep inside Earth
- from the weight of sediments pushing down on bedrock

A: from rocks under stress shifting deep inside Earth

Q: Answer the question

A carpenter covered a piece of wood with a thin sheet of paper. He struck the covered piece of wood with a hammer. The impact left a small hole in the paper that smelled of smoke. Which kind of energy transfer did this event most likely demonstrate?
OPTIONS:
- chemical to thermal
- mechanical to thermal
- mechanical to chemical
- chemical to mechanical

A:
mechanical to thermal