The solvent in a solution evaporates out over time, leaving behind the solute.

why is this a mixture?

select all that apply.

distillation is a separation method that uses evaporation.
the solution is made up of the solvent and solute.
the solvent and solute are separated by physical means.
the solute does not evaporate because it is heavy.

The solution is made up of the solvent and solute.

The solvent and solute are separated by physical means.

Explanation:

Any mixture must have a solvent and solute, or else it can't be classified as a mixture.

Additionally, I took a test and debated between the "distillation" and "physical means" problem, and got the "distillation" one wrong. It does make sense; evaporation is a physical mean through which the solvent is separates from the solute, even if it isn't caused by humans.

The 4th one just sounds absurd, and I would be shocked if it were correct.