Answer the following question given this paragraph: 

Like a chemical compound, a mixture consists of more than one chemical substance. Unlike a compound, a mixture does not have a fixed chemical composition. The substances in a mixture can be combined in any proportions. A mixture also does not involve a chemical reaction. Therefore, the substances in a mixture are not changed into unique new substances, and they can be separated from each other without a chemical reaction.


Q: What is the term for a combination of substances in which there is no chemical reaction?

 Choices:

- a combination

- a solute

- a solution

- a mixture

A:
a mixture
