Answer:
Atmosphere is very important for sustaining life:
It contains various gases like O2, CO2, N2 which are required for various life processes by plants and animals.
(ii) gas is used by plants to prepare food by the process called photosynthesis
(iii) Oxygen is required for burning, combustion and respiration.
(iv) Ozone layer is acting as a protective layer which avoids/prevents harmful U.V. rays to enter the Earth's atmosphere.
(v) Atmosphere acts as a temperature buffer.
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