Question

what is a mixture? a substance made of only one type of atom a compound with a fixed ratio of elements a combination of two or more pure substances a single element in its pure form

Explanation:

A mixture is defined as a combination of two or more pure substances. Each substance in the mixture retains its own chemical properties and they are not chemically bonded to each other. A substance made of only one - type of atom is an element, a compound has a fixed ratio of elements, and a single element in its pure form is just that - a pure element, not a mixture.

Answer:

A combination of two or more pure substances