It deflects harmful radiation and keeps earth at livable temperatures.
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the biosphere, the atmosphere, and the geosphere
The climate of the earth and the earths atmosphere
The earth's atmosphere comprises a volume of gases and that cannot be measured in square miles.
Where the Earth is concerned, humans live in the 'biosphere', together with all other living matter. Overlapping the biosphere, are the hydrosphere, and the atmosphere, and below us , inside the Earth, is the lithosphere. Above the atmosphere is the stratosphere, and then the ionosphere. NB All theses 'spheres' overlap to some extent.
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.