An example of a grad-school level question?
Which type of organism is at the lowest level of the food chain?

An example of a grad-school level question?
Which type of energy in gasoline is transformed into mechanical energy in a motorcycle engine?

An example of a grad-school level question?
Which characteristic is most beneficial for an animal living on a snowy mountain?

An example of a grad-school level question?
Materials must pass through a cell's semi-permeable membrane in order for energy to be utilized. This process is called