Chemistry
Air is said to be saturated when :

It contains maximum content of water vapour
It blows over the barren land
Its pressure is minimum
Its thickness is maximum

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Chemistry
Man dies in the atmosphere of CO, because it

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

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