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Why is the atmosphere essential for life?

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If we talk about outer space, the temperature conditions are highly variable. At those conditions, any biotic component or an organism cannot survive. The atmosphere of a planet acts as a barrier against these conditions. 

1) It maintains a range of temperatures at which organisms can survive. 

2) It maintains other factors like a steady-state of components like water, a specific percentage of gases, gravity. 

3) Prevents us from the harmful U.V radiation coming from the sun. 

4) Maintains surface components like soil which are essential for survival.

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