Does a solution have to be a liquid mixture? Explain why or

why not.

No

Solutions can be solids dissolved in liquids. Solutions can also be gases dissolved in liquids, I. E carbonated water. You likely won't discover individuals making solid arrangements. They as a rule start off as solid/gas/fluid arrangements and afterward solidify at room temperature. alloys with a wide range of metals are genuine instances of solid arrangements at room temperature.

Is it just me but i can't see your question it's blank