In biosphere II,the system did not remain totally self-contained because soil bacteria produced more CO₂ than anticipated requiring oxygen to be pumped in from outside.

Name: In biosphere II,the system did not remain totally self-contained because soil bacteria produced more CO 2 than anticipated requiring oxygen to be pumped in from outside.
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This is true, as excess CO₂ production by soil bacteria led to a shortfall of oxygen in the Biosphere II system, requiring outside oxygen to be pumped in.

In Biosphere II,the System Did Not Remain Totally Self-Contained Because