My biology teacher left me and my classmates this assignment. You needed to go on this biology website and choose an article. I chose Ecology and Economics because it looked interesting and different from the other topics you could choose from.The article mainly talks about giving a monetary value to ecosystems. The word I didn't understood was underlie. It means to form the foundation of. It was used to say that the mechanics that underlie both economy and ecology are similar.
Ecology and Economics: www.actionbioscience.org/environment/polasky.html