How is oxygen in air renewed?
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The oxygen cycle has three main reservoirs namely atmosphere, biosphere and lithosphere.These describes the movement of oxygen. Also the main factor for oxygen cycle is photosynthesis, which is responsible for earth's atmosphere
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oxygen in the air is renewed by the physiological process of photosynthesis carried out by plants in which they absorb the atmospheric water vapour and carbon dioxide to synthesise their own food and oxygen is released in this process as a by-product.
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