The oxygen cycle describes how oxygen is produced by photosynthesis, used in respiration, and recycled through the environment. Almost all oxygen in t
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Why is atmospheric oxygen at 21% and not higher or lower?
Photosynthetic production and respiration consumption are balanced. If oxygen rose above 21%, fires would become more common and consume more. If it fell, respiration would decrease and allow oxygen to rebuild. This balance is self-regulating.
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What is the relationship between the oxygen cycle and the carbon cycle?
The same photosynthesis that produces oxygen also fixes carbon. The same respiration that consumes oxygen also releases carbon. The two cycles are inseparable, linked by photosynthesis and respiration.
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How do anaerobic organisms survive without oxygen?
Anaerobic bacteria use chemical compounds other than oxygen as electron acceptors during respiration. For example, they may use nitrate, sulfate, or iron. This produces less energy than aerobic respiration but allows survival in oxygen-free environments.
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