Chemistry
Exposure to mixtures of chemicals are greater than expected on the basis of effects of exposure to each chemical individually. This is known as

Synergism
Independent
Additives
Antagonism

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Chemistry
The main use of salt in the diet is to

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

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