Judy Vesel, Principal Investigator and Project Director

Linda Bean-Pardee, Project Designer
Bryce Flynn, Senior Web Designer and Illustrator
Robby Griffin, Web Support Specialist
Topher Hagemeier, Curriculum Developer
Arthur Johnson, Project Evaluator
David Libby, Director of Information Systems
Vanessa Layne, Web Toolsmith
Lisa M. Miller, Senior Web Developer
Matthew O'Toole, Web Consultant
Tara Robillard, Materials Developer and Evaluator
Laura Uhl, Editor

Beverly Battle, Harriet Tubman Elementary School, Washington, DC
Susan Botts, Chain of Lakes Middle School, Orlando, FL
Janet Calvert, Bruce Street School for the Deaf, Newark NJ
Laura Glish, Baker Middle School, Troy, MI
Betty Hernandez, Tuba City Boarding School, Tuba City, AZ
Todd Hindman, Anvil City Science Academy, Nome, AK
Susan Hurstcalderone, Our Lady of Lourdes School, Bethesda, MD
Saundra Kent, McKelvie Middle School, New Bedford, NH
Robert Kopicko, Abbott Middle School, West Bloomfield, MI
Richard Meskowitz, Randolph Middle School, Randolph, NJ
Shannon Miller, Llano Junior High School, Llano, TX
Nancy Remig, St. Michael School, Orland Park, IL
Annabelle Shrieve, Holy Souls Catholic School, Little Rock, AR
Christopher Soldat, Mid-Prairie Middle School, Kalona, IA
Hilda E. Taylor, M.V.Leckie School, Washington, DC.

Elena Dworkin Wright, Managing Editor

Concetta Brown, Production Designer
Claudette Dawes, Editor
Sarah McAbee, Production Designer
Alyssa Mito Pusey, Editor
Martha MacLeod Sikkema, Production Designer

This unit was developed by TERC and funded in part by the National Science Foundation, Grant ESI-9553592, and the National Geographic Society. All opinions, findings, conclusions, and recommendations expressed herein are those of the authors and do not necessarily reflect the views of the funders. A prior version of the unit was developed by TERC in collaboration with the National Geographic Society and published as the Are We Getting Enough Oxygen? part of the National Geographic Kids Network series.