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They take along supply of oxygen in tanks maybe in a liquidic form, but i could be wrong. It will be regulated by clever machines also, so no need to worry about a lack of fresh air. You can't grow plants out in open space, but you could grow them i suppose i a spacestation with all the necessery requirements for germination and growth.
I think I once heard that they also generate oxygen by electrolysis of water but I also heard that they use fuel cells for power. It would be odd if they did both at the same time.
It would be odd if they did both at the same time.
Ah well, I read "at the same time" as "on the same mission", not literally "at the same moment"... although actually I can imagine situations in which they might if there were an O2 generator running somewhere in the ship generating the "breathing" oxygen and a fuel cell that charges/discharges itself in a contained system somewhere else (analogous to a battery). Tho' I'm not thinking very hard about this so I may have missed something.