An example of a grad-school level question?
Which piece of lab equipment is necessary to determine the mass of 2 teaspoons of sand?

An example of a grad-school level question?
Which of these is never found in prokaryotic cells?

An example of a grad-school level question?
Which activity is an example of a good health habit?

An example of a grad-school level question?
A student poured water into a plastic tray. The student then put the tray into the freezer. What property of the water changed as the water froze?