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2015-09-02T18:04:07+08:00

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Oxygen is primarily used by all living things to breakdown food to energy in a process called oxidation. We get this oxygen by respiration process. 

Apart from this plants use oxygen to make their food using sunlight in presence of Chlorophyll.                                                                                                                                                                                                                                            so basically, my answer is Respiration  and Oxidation

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2015-09-02T18:05:36+08:00

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This process called photosynthesis they process the carbon dioxide to oxygen to release in the atmosphere.
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