Chemistry
The BOD values of water indicate the

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

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Chemistry
The main use of salt in the diet is to

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

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