Which process directly contributes to the release of oxygen into the atmosphere?
Photosynthesis by plants and algae
In photosynthesis, green plants and algae use sunlight and chlorophyll to convert carbon dioxide and water into glucose: \(6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2\).
The oxygen released comes from the splitting (photolysis) of water, and this is the main natural source of atmospheric oxygen; marine algae and phytoplankton contribute a large share.
Respiration by animals and plants, decomposition of organic matter and combustion of fossil fuels all consume oxygen and release carbon dioxide.
Hence, the answer is Photosynthesis by plants and algae.
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