An example of a grad-school level question?
Which statement best explains why a car that is rolling on a level surface will eventually come to a stop?

An example of a grad-school level question?
Which nongaseous compound can be made from two elements that are gases at room temperature?

An example of a grad-school level question?
Where is the biological magnification of pollutants most likely to be the greatest?

An example of a grad-school level question?
Which property best indicates that soil contains nutrients?