Marine Phytoplankton. Contains over 70% of the world's oxygen.
Most of the worlds oxygen is produced by Trees.
Because most of the Amazon Rainforest is within its borders, and the Amazon Rainforest prduces most of the oxygen we use to breathe.
Tracheophytes (trees/green plants) provide most of the world's oxygen.
tree or seaweed
Growing more trees as trees take in carbon dioxide and releases oxygen that we use for breathing. So. I guess Afforestation provides most of the oxygen found in the earths atmosphere.
Oxygen consternation is the most important for patient. Oxygen concentrate provides oxygen to the patients who require more oxygen than normal air
it provides food and most important the oxygen
respiration
i do not know if you mean a specie or place. but i do know that plants provides the earth with oxygen. if you are looking for a place, then look at a place with the most plants. if you are looking for a specie, plants, provide the earth withoxygen (plants breathe in carbon dioxide and breathe out oxygen)
Air is approximately 20% Oxygen.
It provides them oxygen and glucose.