An example of a grad-school level question?
Which stimulus causes a porcupine to extend its quills?

An example of a grad-school level question?
Roger poured water over a pile of sand. Some of the sand washed away. This process is similar to which of the following?

An example of a grad-school level question?
Which metric unit is used to describe an object's length?

An example of a grad-school level question?
Different species of carnivorous animals that share the same habitat in an ecosystem may