An example of a grad-school level question?
A student pushes a wooden block across a sheet of sandpaper. Which characteristic of the block increases?

An example of a grad-school level question?
Which system of the human body provides protection to most of the major organs?

An example of a grad-school level question?
When plants undergo photosynthesis, a reaction produces sugar, oxygen, and water. During respiration, stored energy from the products of photosynthesis is converted to usable energy. In what form is the energy stored prior to use in respiration?

An example of a grad-school level question?
Atoms of which of these elements are part of many organic molecules?