Chemistry
Sulphur dioxide level in the atmosphere can be reduced by using

Catalytic converters in industry
More efficient car engines
Static electricity to attract it in factory chimneys
Low - sulphur fuels

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Chemistry
The main use of salt in the diet is to

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

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