Chemistry
Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful

Solar infrared radiation
Solar ultraviolet radiation
SO2 in the air
CO2 in the air

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Chemistry
The main use of salt in the diet is to

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

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