Which term best defines a material formed by two or more substances that are uniformly distributed at the molecular level?

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A solution is a homogeneous material where a solute has dissolved in a solvent, so the components are dispersed at the molecular level. This means the mixture has a single phase and you can’t distinguish the individual substances by appearance. A compound is a chemically bonded substance with a fixed ratio of elements, not simply two substances dissolved together. An element is just one type of atom, and a mixture can be either heterogeneous or homogeneous but isn’t necessarily distributed at the molecular level. So the description fits a solution.