Question

What is source of O2​

Answer 1

Answer:

See the picture .

please mark as brainliest answer.

Answer 2

Answer:

photosynthesis

Explanation:

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.