An example of a grad-school level question?
Which process moves an ion across a cell membrane against the concentration gradient?

An example of a grad-school level question?
The change in the use of one model of the solar system to the use of another model resulted in major changes in science and society. Which two scientists produced the earlier and later models, respectively?

An example of a grad-school level question?
What is an example of a shelter in an ecosystem?

An example of a grad-school level question?
A student is writing a report on volcanoes. What should the student include to best help explain how a volcano works?