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A crystalline substance, an extremely important material in the electronics industry (semiconductors, integrated circuits).

One of the isomers of pentane, used as a solvent.

The system of circles of latitude and longitude on the globe enable every location on the Earth to be exactly specified.

This animation demonstrates instruments used to examine atmospheric phenomena.

Raw iron is produced from iron ore in iron smelters.

The reproductive system is a series of organs working together for the purpose of reproduction.

One of the isomers of butene.

One of the twenty protein-building amino acids.

One of the 20 amino acids that make up proteins.

One of the 20 amino acids that make up proteins.

One of the twenty protein-building amino acids.

One of the 20 amino acids that make up proteins.

One of the 20 amino acids that make up proteins.

One of the 20 amino acids that make up proteins.

An amino acid containing sulphur, one of the amino acids that make up proteins.

One of the twenty protein-building amino acids.

Clothing reflects the lifestyle and culture of the given era and region.

One of the 20 amino acids that make up proteins.

Dresses reflect the lifestyles and culture of the given era and region.

Narrow streets and colourful houses gave medieval towns a special atmosphere.

The recorder is a woodwind musical instrument, a type of fipple flute.

One of the 20 amino acids that make up proteins.

A sulphur-containing amino acid.

The ester of formic acid and methanol, an aroma compound found in certain fruits.