An example of a grad-school level question?
Which function do kidneys provide to maintain homeostasis?

An example of a grad-school level question?
What causes a person to have blue eyes?

An example of a grad-school level question?
A pencil falls off of a desk. What moves the pencil toward the floor?

An example of a grad-school level question?
A scientist studies the remains of two extinct animals to learn more about how they lived. She determines that one animal was a carnivore and the other was an herbivore. Which of the following did the scientist most likely compare to make this conclusion?