An example of a grad-school level question?
When nitrogen-rich runoff from farms enters a nearby farm, it causes abundant growth of algal mat on the pond surface. As a result, underwater plants in the pond begin to die. Identify the limiting factor that is most responsible for causing the underwater plants to die.

An example of a grad-school level question?
If the atomic mass number of an atom is 35, which statement is most accurate?

An example of a grad-school level question?
A class is studying textures and collects several samples. Which of these items would the students most likely use magnification to study?

An example of a grad-school level question?
Life is more likely to be found on a planet whose atmosphere contains abundant