Q: Unlike pure substances, mixtures have a what?


Read this paragraph and choose the correct option from the provided answers:

When two or more pure substances are combined together, a mixture is formed. Unlike pure substances, mixtures have a variable composition. Variable composition indicates that the relative proportions of the mixtures components may vary, and they can be separated by physical methods. There are two main types of mixtures.

 Choices:

- efficient composition

- unique composition

- complex composition

- variable composition


A:
variable composition