Citation

-Author Anonymous. Miller-Urey Experiment. [Online] Available: http://en.wikipedia.org/wiki/Miller-Urey_experiment, October 3, 2006 .

-Author Anonymous. Origin of Life. [Online] Available: http://en.wikipedia.org/wiki/Origin_of_life, December 19, 2006.

-Author Anonymous. The Characteristics of Life. [Online] Available: http://www.resa.net/nasa/biology_systematics.htm, December 21, 2006.

-Maton, Anthea, Hopkins, Jean, Johnson, Susan, LaHart, David, Warner, Maryanna Quon, and Jill D. Wright. Exploring Life Science. New Jersey: Upper Saddle River, 1999.

Images

-http://www.freewoodpuzzles.com/letters.html

-http://biology.clc.uc.edu/graphics/bio104/redi.jpg