Through oxygen cycle.
Humans and animals take in oxygen and give out carbon dioxide.
Plants take in carbon dioxide and give out oxygen.
This ways the oxygen is circulated in the atmosphere.
The nitrogen and oxygen in Earth's atmosphere together account for a speck more than 99% of it..
78% Nitrogen 21% Oxygen
atmosphere
Much less than the approximate 21% in the air. Perhaps half that. Fish need a large energy expenditure to strain oxygen from the water. Most of the oxygen produced by phytoplankton, for instance, is vented into the atmosphere.
The ratio is approxNitrogen : Oxygen : Argon : Carbon Dioxide :: 39000 : 10500 : 465 : 19.
Oxygen is replaced through the process of photosynthesis, where plants and other producers take in carbon dioxide and release oxygen as a byproduct. Additionally, oxygen is replenished by the dissolving of oxygen gas from the atmosphere into water bodies.
The atmosphere is 79.9% oxygen.
21% of the atmosphere is oxygen.
the environment which has the availability of oxygen it is called aerobic atmosphere and if the availability of oxygen is not there in atmosphere then it is anaerobic type We live in a aerobic atmosphere which has the oxygen available
No, there is no oxygen in Mercury's atmosphere because Mercury does not have an atmosphere.
About 21% of the Earth's atmosphere is oxygen.
Plankton gives more oxygen to the atmosphere.
Cyanobacteria make molecular oxygen in our atmosphere.
Animals remove oxygen from the atmosphere.
Yes, oxygen makes up 20.9% of the atmosphere.
Approximately 21% of Earth's atmosphere is made up of oxygen.
Photosynthesis is carried on by plants that produce oxygen.This process has replaced all oxygen that is in the atmosphere for more than 2 000 years.