Through which process is oxygen returned to the atmosphere?


Oxygen is returned to the atmosphere through photosynthesis.


  • Photosynthesis is the process used by green plants and a few organisms that use sunlight, carbon dioxide and water to prepare their food.
  • Plants, algae, and certain bacteria use the photosynthesis process to turn light energy into chemical energy.
  • Photosynthesis produces glucose, which provides organisms with two essential resources: energy and fixed carbon.


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