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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 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.

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

One of the 20 amino acids that make up proteins.

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

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

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

One of the 20 amino acids that make up proteins. It contains an aromatic ring as part of its side chain.

One of the 20 amino acids that make up proteins.

A sulphur-containing amino acid.

One of the 20 amino acids that make up proteins. Its amino group and the 3rd carbon atom of the side chain form a ring.

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

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.

One of the 20 amino acids that make up proteins. It contains an aromatic ring as part of its side chain.

The palace and park complex is Hungary´s grandest Rococo edifice, often called the ´Hungarian Versailles´.

The fortress was a member of the chain of fortifications built to protect against the Ottoman invaders. Its construction started in the 13th century.