An example of a grad-school level question?
Which adaptation often helps an animal attract a mate?

An example of a grad-school level question?
A scientist on a field trip discovered a new organism. She examined its cells under a microscope and observed several different structures, including a nucleus, a cell wall, and some chloroplasts. This organism would correctly be classified in which of the following kingdoms?

An example of a grad-school level question?
Every year, green sea turtles migrate approximately 2000 km to reproduce. This migration is an example of

An example of a grad-school level question?
Which is considered a nonrenewable resource?