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Oxygen is returned to the atmosphere mainly by:A. Burning of fossil fuel B. Respiration C. Photosynthesis D. Fungi |
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Answer» During the process of photosynthesis, plants lead to the formation of complex sugars (food) using water and carbon-di-oxide in the presence of sunlight and release oxygen into the environment. While processes like burning fuels and respiration release carbon-di-oxide into the air. |
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