wrote in message
ups.com...
JennyC wrote:
Google has a LOT of info :~)
http://www.google.com/search?hl=en&l...t+ox ygen+co2
http://www.google.com/search?hl=en&l...pher e+oxygen
Jenny

Thx... obvious source I had checked. The model of biosphere 2 is a good
one for educational purposes:
http://bioquest.org/simbio2.html
AA
http://www.myspace.com/aa_spaceagent

Is this going into a book plot ?
Jenny :~)