Q How are the symptoms of the illness related to cellular respiration? How would you test your hypothesis that the low oxygen levels are related to the illness? How did the addition of the compost bin contribute to the loss of oxygen in the Hab? What are the potential dangers of not accounting for microorganisms when designing a plan for an off planet base? Explain why you can close off the oxygen supply to the bacteria in the compost bin yet decomposition can continue. How many plants are needed to support the oxygen needs of the Expedition Team? Is the Team growing too many plants? Is it possible to make too much oxygen? Hypothesize what happens when there is too much oxygen in the atmosphere?