Chemistry
Man dies in the atmosphere of CO, because it

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

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Chemistry
Water cycle refers to

Constant movement of water from ocean to land and back to ocean once again
Scientific management of water in areas excessively plagued with water-logging
An integrated attempt to recycle water in relatively arid regions
Water distribution in relatively dry areas

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