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I thought it was something like that. So this forum is misnamed. It should be "Cells, viruses and other microbes".
Many suspected the drop in oxygen was due to microbes in the soil. The agricultural, savanna and rain forest sections had all been infused with microbes in order to encourage plant growth. In addition, the overall quantity of carbon installed in the soil at the beginning of the experiment was too high. It was now felt that these microbes were consuming too much oxygen, converting the carbon in the soil into carbon dioxide and removing the oxygen from the air.One problem critics of this theory have cited was that microbes breathing that much oxygen would also be creating a massive amount of carbon dioxide. So the jump in CO2 would have been greater than what was actually detected in the atmosphere readings. Further investigation revealed that the concrete at the base of the facility had been absorbing much of this carbon dioxide as it cured. This effect absorbed a large portion of the carbon dioxide being produced by the microbes which in turn had been depleting the facility's oxygen supply.According to the general biology textbook "Biology" by Neil Campbell and Jane Reece, Biosphere 2 suffered also from CO2 levels that "fluctuated wildly" and that most of the vertebrate species and all of the pollinating insects died. Ants were deliberately introduced since they are a companion to one of the tree species (Cecropia) in the Rain Forest.
ITS WHAT I WEAR BEFORE I GO BED