An example of a grad-school level question?
Which of the following statements best explains why stars appear to move across Earth's sky each night?

An example of a grad-school level question?
Increased populations can lead to the depletion of locally available resources. Compared to other communities, which of these locally available resources is most likely to be depleted in desert communities?

An example of a grad-school level question?
Which two body systems are directly involved in movement?

An example of a grad-school level question?
High-altitude cirrus clouds are primarily formed from which substance?