Additional solute is added to a saturated solution of a solid and a liquid after being heated above room temperature. Once no more of the solute can dissolve, the solution is filtered, then cooled, and a seed crystal is added. At which of the following points is the solution unsaturated? (select all that apply).

Which of the following comparisons is true? a: high school tests generally cover more material than college exams. b: your college curriculum is more fixed and standardized than your high school curriculum. c: you get more personal attention in class from your college professors than from your high school teachers. d: college professors usually don't review test material in class the way high school teachers do.