Chemistry
Man dies in the atmosphere of CO, because it

Reduces the organic matter of tissues
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

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Chemistry
The main use of salt in the diet is to

produce in small amounts the hydrochloric acid required for the digestion of food
make the taste of food better
ease the process of cooking
increase the solubility of food particles in water

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