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what process gives off oxygen to the atmosphere?

Sagot :

PamPam15idn
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
100percentcorrectidn
This process called photosynthesis they process the carbon dioxide to oxygen to release in the atmosphere.