Oxygen is primarily produced through photosynthesis by plants, algae, and some bacteria .

Aqui está como funciona:

* Fotossíntese: This process uses sunlight, water, and carbon dioxide to create glucose (sugar) for the plant's energy and oxygen as a byproduct.
* plantas: The majority of oxygen in the atmosphere is produced by plants, particularly trees.
* algas : These tiny organisms in water bodies also contribute significantly to oxygen production.
* cianobactérias: These bacteria are known as "blue-green algae" and play a vital role in oxygen production, especially in the early history of Earth.

It's important to remember that oxygen is also produced in small amounts through other processes like water electrolysis (splitting water into hydrogen and oxygen using electricity) and photocatalysis (using light to break down water into oxygen). However, these processes are not significant contributors compared to photosynthesis.