Write just a few sentences for an imaginary situation if any of the following gases disappear from the atmosphere.
Oxygen

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Solution

The survival of life on the earth is very much dependant on the presence of oxygen. All the living organisms need oxygen to respire and survive.
Also oxygen is required for burning of all substances.
So the absence of oxygen will lead to an earth without life and fire.

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Question 18.2

Write just a few sentences for an imaginary situation if any of
the following gases disappear from the atmosphere

Nitrogen

Question 18.3

Write just a few sentences for an imaginary situation if any of
the following gases disappear from the atmosphere

Carbon dioxide

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