An example of a grad-school level question?
After months of studying and obtaining data on the behavior of birds, biologists from around the world will look at the data and

An example of a grad-school level question?
Which gas makes up the greatest percentage of Earth's atmosphere?

An example of a grad-school level question?
What will be the most likely result for some species of animals with the continued burning of rain forests in Africa?

An example of a grad-school level question?
Moving water was the most important factor in forming which of these?