Question

elements and compounds are both ____ that have their own unique properties. dynamic material forces medleys pure substances

Explanation:

Elements are substances made of only one type of atom, and compounds are made of two or more different - types of atoms chemically combined. Both have definite and constant composition, which classifies them as pure substances. Dynamic materials are not the correct term here, forces are not related to the nature of elements and compounds in this context, and medleys are mixtures of things which is the opposite of what elements and compounds are.

Answer:

pure substances