51) Give explanation of oxygen cycle.
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free in the air and dissolve in water oxygen in second only to nitrogen abundanse among uncombined element in the atmosphere.
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oxygen cycle ,circulation of oxygen in various forms through nature. free in the air and dissolved with water, oxygen is second only to nitrogen and abundance among uncombained elements in the atmosphere plants and animals use oxygen to respire and return it to the air and water as carbon dioxide (CO2)
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