Asubstance made of two or more elements that have been chemically combined is a(n)

Compound

Explanation:

Element is a pure substance which is composed of atoms of similar elements. Example:

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.  Example:

Mixtures are heterogeneous materials as they do not have uniform composition and the components are not evenly distributed throughout the material. Example: Sugar solution

16

explanation:

the marks go by 4s