An example of a grad-school level question?
A group of vertebrates has lungs, a body covered with scales, internal fertilization, and amniotic eggs. Which group of vertebrates does this describe?

An example of a grad-school level question?
Sunlight passes through the windows of a car and causes the car seats to get hot. Which type of energy flow is involved in heating the seats?

An example of a grad-school level question?
Which environmental problem was directly caused by the invention of the automobile?

An example of a grad-school level question?
In what type of rock would a geologist most likely find evidence of ancient life?