Question

contains two or more atoms combined; mixtures; elements; compounds

Explanation:

• Mixtures are physical combinations of substances, which can have two or more types of atoms but are not chemically combined.
• Elements are made of only one type of atom.
• Compounds are pure substances formed by two or more different atoms chemically combined in fixed proportions. The description "contains two or more atoms combined" refers to chemical combination, which defines compounds.

Answer:

Compounds