You can think of Oxygen as a “makes stuff happen” element. The problem with “making things happen” is that sometimes *too much* happens, or *wrong things* happen.
So a moderate amount allows respiration to happen and carbohydrates to be used for enough energy for life to continue, but too much will cause all the energy in those carbs to release too quickly (i.e. burn) or other similar “oxidation” processes.
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