Please complete the sentence.

A compound can be made from two or more elements or other _________ joined together in a fixed composition.

materials

A compound can be made from two or more elements or other substances joined together in a fixed composition. To determine the missing word, we need to understand the concept of compounds.

Compounds are formed by chemically combining elements or other substances. The joining together occurs through chemical bonds. The resulting compound has properties that are different from the properties of the individual elements or substances that make it up.

In this context, the missing word can be filled with "substances" as the sentence suggests that compounds can be made from elements or other substances. These substances could be either elements or compounds themselves, as long as they are combined in a fixed composition.