An example of a grad-school level question?
There are several different types of rock. Each type of rock is formed under different conditions. How are sedimentary rocks, such as shale and sandstone, formed?

An example of a grad-school level question?
What characteristic helps a rabbit survive in a winter environment?

An example of a grad-school level question?
What is true of mutualistic relationships among organisms?

An example of a grad-school level question?
What is the most prominent land feature formed by the convergence of the Indo-Australian and Eurasian plates?