Nswering four quesions in an exam essay

Our second exam essay is coming. Its also about answering four biology quesions in an exam essay. You can find 3 sourses on our course website (Textbook, Nature Journal, and Lectures). For the Style, my instructor wants us to use Literature Citation, although I didnt find it on the Styleabove. So I just selected MLA format. But its not what we need to use. This is an online class, so you can find the 3 sourses and any other information you need on our course website (biodiversity/04exams.htm). Please notice that this is our second exam, so you just need to click the link for the second exam which is due on 4/16/12. Please feel free to ask me any information about this exam essay. Thank you for your time.