Chemistry
Nitrogen fixation is a process of

Utilisation of nitrogen gas
Assimilation of nitrate
Conversion of organic nitrogen to proteins
Conversion of molecular nitrogen to ammonia

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Chemistry
The main use of salt in the diet is to

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

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