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inna [77]
3 years ago
9

How much oxygen is contained in the atmosphere?

Biology
1 answer:
maw [93]3 years ago
7 0
Oxygen makes up 20% of the atmosphere while nitrogen makes up 78%. The other two percent is made up of other gases. Population growth would slow. Organisms need water to survive and if there is a limited amount of water, populations will decline. 
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