Both are considered mixtures<span> - that is, they are made up of two or more pure substances. ... A </span>heterogeneous mixture<span> appears to be made of </span>different<span>substances. A </span>solution<span> appears the same throughout. In the fluid phase (gas or liquid, or any combination of those) a </span>solution<span> is transparent (thought not colourless). hope that helps</span>