An example of a grad-school level question?
In one area, a large source of prey for eagles is rabbits. If the number of rabbits suddenly decreases, what effect will it most likely have on the eagles?

An example of a grad-school level question?
Warm water contains less dissolved oxygen than colder water. Which population will be most affected by a long period of hot, dry days?

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

An example of a grad-school level question?
All living things need energy to survive. What is the primary source of energy for all living things?