An example of a grad-school level question?
An astronomical unit (AU) refers to the distance between

An example of a grad-school level question?
The main source of food for a coyote population in one area is mice. Which is most likely to happen to these coyotes if a new predator begins eating the mice?

An example of a grad-school level question?
Which part of an atom is involved in chemical reactions?

An example of a grad-school level question?
Rheumatoid arthritis is a disease that occurs when the body attacks its own tissues. Which body system becomes disordered first?