Question

what is source of O2?​

Answer 1

✨❤The main source of atmospheric free oxygen is photosynthesis, which produces sugars and free oxygen from carbon dioxide and water: Photosynthesizing organisms include the plant life of the land areas as well as the phytoplankton of the oceans. ✨

Answer 2

✨HERE IS YOUR ANSWER ✨

◾the correct answer of this question is

◾:◾ PHOTOSYNTHESIS

The main source of atmospheric free oxygen is photosynthesis, which produces sugars and free oxygen from carbon dioxide and water: Photosynthesizing organisms include the plant life of the land areas as well as the phytoplankton of the oceans.

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