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

Ex Input:
What is light that has only a single wavelength called?

Ex Output:
monochromatic

Ex Input:
What is the term for a substance that increases the rate of a chemical reaction but is not changed or used up in the reaction?

Ex Output:
a catalyst

Ex Input:
Two major types of fungus-like protists are slime molds and which other?

Ex Output:
water molds