Which elements are recycled in the carbon-oxygen cycle

Explanation:

The oxygen cycle describes the various forms in which oxygen is found and how it moves through different reservoirs on Earth. There are three major reservoirs of oxygen: the atmosphere, biosphere, and lithosphere. Some people also consider the hydrosphere, a subdivision of the biosphere, to be the fourth reservoir

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for a different answer set the answer would be because the oxygen in the water had depleted (apex)