Life Support System

[Hayden James]

I heard that the reason for the failure of the Biosphere 2 project was
the constant need of replenishing of oxygen.  The plants could not
effectively regenerate the amount of oxygen.  Also I know that the
reason for the low levels of oxygen was the absorbtion of oxygen from
microorganisms found in the soil and other parts.  Can someone explain
the process of the absorbtion of oxygen from microbes? What microbes are
resonbible for the absorbtion of oxygen in the system?