Chemistry
The lustre of the metals is because of

High density, due to closed packing of atoms
Reflection of light due to the presence of free electrons
High polish
Absorption of light due to the presence of cavities

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Chemistry
The main use of salt in the diet is to

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

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