Chemistry
Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful

Solar infrared radiation
Solar ultraviolet radiation
SO2 in the air
CO2 in the air

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Chemistry
Man dies in the atmosphere of CO, because it

Combines with O2 present in the body
Combines with the haemoglobin of blood, thereby making the later incapable of absorbing O2
Dries up the blood
Reduces the organic matter of tissues

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