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The earths atmosphere is made up of 78% nitrogen and 21% oxygen
oxygen
Oxygen makes up 21% of the Earths atmosphere.
It came from primitive organisms early in earth's history. They were the first organisms to use photosynthesis to make food, by using light to convert Carbon dioxide and water into glucose (food) and oxygen. Since oxygen is a waste product of photosynthesis, it was released into the air. As more and more of these organisms multiplied, large amounts of oxygen were released into the air, forming today's atmosphere.
The balance of oxygen and carbon dioxide is maintained in the atmosphere by the oxygen released by plant during photosynthesis and carbon dioxide released by human ,animal's etc in the atmosphere
Earths atmosphere dose have oxygen in it, without it we would all be dead we require oxygen to breathe.
The earths atmosphere is made up of 78% nitrogen and 21% oxygen
no
97%
oxygen
yes
The Earths atmosphere protects the earth from meteors and it tgives us oxygen
Nitrogen makes up 78% of the earths atmosphere Oxygen makes up 21% of the earths atmosphere
Free oxygen
Photosynthesis
oxygen
Plants