An example of a grad-school level question?
Which statement best explains Earth's day and night cycle?

An example of a grad-school level question?
In what way do transit systems, such as buses, benefit society?

An example of a grad-school level question?
A cow and a frog have similar bone structures in their forelimbs. Both have phalanges, radius, ulna, and humerus bones. However, the cow and frog are animals with very different life cycles from each other. Which most likely describes why the body structures of these animals are so similar?

An example of a grad-school level question?
What determines how long the Moon takes to complete one cycle of phases?