Oxygen is one of the important gases found ion the atmosphere .It can be found in the form of compound of oxide ,carbonate and water in natural . Respiration and photosynthesis play an important role in order to maintain the oxygen cycle in nature . Human being ,plants and other animals get oxygen from water and release out carbon dioxide .Plants prepare their food through the photosynthesis process in they absorb dioxide from the air and release oxygen which ix mixed to the atmosphere .Thus photosynthesis process also helps to conduct 
the oxygen.
Oxygen is vital to us in many ways (beside the most obvious--for breathing). Water can dissolve oxygen and it is this dissolved oxygen that supports aquatic life. Oxygen is also needed for the decomposition of organic waste. Wastes from living organisms are "biodegradable" because there are aerobic bacteria that convert organic waste materials into stable inorganic materials. If enough oxygen is not available for these bacteria, for example, because of enormous quantities of wastes in a body of water, they die and anaerobic bacteria that do not need oxygen take over. These bacteria change waste material into H2S and other poisonous and foul-smelling substances. For this reason, the content of biodegradable substances in waste waters is expressed by a special index called "biological oxygen demand" (BOD), representing the amount of oxygen needed by aerobic bacteria to decompose the waste.
the oxygen.Oxygen is vital to us in many ways (beside the most obvious--for breathing). Water can dissolve oxygen and it is this dissolved oxygen that supports aquatic life. Oxygen is also needed for the decomposition of organic waste. Wastes from living organisms are "biodegradable" because there are aerobic bacteria that convert organic waste materials into stable inorganic materials. If enough oxygen is not available for these bacteria, for example, because of enormous quantities of wastes in a body of water, they die and anaerobic bacteria that do not need oxygen take over. These bacteria change waste material into H2S and other poisonous and foul-smelling substances. For this reason, the content of biodegradable substances in waste waters is expressed by a special index called "biological oxygen demand" (BOD), representing the amount of oxygen needed by aerobic bacteria to decompose the waste.
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