A substance made up of two or more elements not combined chemically is called a mixture.

Here's why:

* Elements are the simplest forms of matter and cannot be broken down further by chemical means.

* Mixtures are combinations of two or more substances where each substance retains its own chemical identity. The components of a mixture can be physically separated.

Examples of mixtures include:

* Salt and pepper

* Sand and water

* Air (a mixture of gases)

* Salad

Let me know if you have any other questions!