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
Reduces the organic matter of tissues
Dries up the blood

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Chemistry
The BOD values of water indicate the

Amount of oxygen used for biochemical oxidation
Amount of organic debris
Amount of oxygen used for biochemical reduction
Amount of ozone used for biochemical oxidation

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