An example of a grad-school level question?
Which statement is describing climate?

An example of a grad-school level question?
Which step will most likely ensure that the results of an investigation are valid?

An example of a grad-school level question?
When a boy stands in a field in the sunlight, he usually is able to see his

An example of a grad-school level question?
A student finds a round, smooth pebble on a beach. Which action made the pebble smooth?