An example of a grad-school level question?
When too much salt is detected in the bloodstream, the brain secretes a hormone that helps the body retain water by reducing the amount of urine produced. This is an example of

An example of a grad-school level question?
Noah studied different systems in the human body. Which best describes a function of veins in the circulatory system?

An example of a grad-school level question?
Which renewable energy resource possesses the greatest potential for providing renewable energy to meet the future needs of the southern United States?

An example of a grad-school level question?
Which of these is the main contributor to the formation of hurricanes?