World Builders™                                                                    Session Four  --  Microbiology             Oxygen         The Gene Pool     

Living things must focus on two tasks, reproduction and energy capture.

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Photos from archives at Biology Department, University of Bowling Green, Ohio
Header by Viau from Yellowstone National Park
© 1996,1997, 1998, 1999, 2000, 2002, 2003.   Elizabeth Anne Viau. All rights reserved. This material may be used by individuals for instructional purposes but not sold. Please inform the author if you use it at .