An example of a grad-school level question?
A student proposes the rate of increase in a plant's mass will be proportional to the length of light exposure per day when all other variables are constant. How should this proposal be classified?

An example of a grad-school level question?
Which human body system produces the hormones that regulate growth?

An example of a grad-school level question?
Which of these can be recycled in an attempt to conserve resources?

An example of a grad-school level question?
Which of these would best be shown as a 3-D model?