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Life Support
Earth's
Atmospheric Layers
http://csep10.phys.utk.edu/astr161/lect/earth/atmosphere.html
Gases in the Atmosphere
http://www.doc.mmu.ac.uk/aric/eae/Atmosphere/Older/
Atmospheric_Gases.html
http://www.spiritone.com/~orsierra/rogue/backgrnd/atmosphr/
atmosgas.htm
Human Respiration
http://www.biology.eku.edu/RITCHISO/301notes6.htm
http://web.ukonline.co.uk/webwise/spinneret/humans/resyst.htm
Hypoxia
http://www.mountainflying.com/hypoxia.htm
CO2
Toxicity
http://www.emedicine.com/wild/topic11.htm
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