Given a scientific question, generate a correct answer to it.

Example Input: What is the general name for a wave that travels along the surface of a medium?
Example Output: surface wave

Example Input: Sugars, starches, and cellulose are examples of what biochemical compounds that organisms use for energy?
Example Output: carbohydrates

Example Input: Water and many metals are materials that have low resistance to electric currents and are therefore known as what?
Example Output:
electric conductors