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Sponge

The most ancient group of animals, they live underwater, lack real tissues and body symmetry.

Endocrine system

Glands of the endocrine system secrete hormones into the blood.

Telescopes

This animation shows optical and radiotelescopes used in astronomical observation.

String quartet

A string quartet consists of four string players, it appeared in the late 18th century.

Gametes

The zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction.

Piano

The piano is one of the most popular instruments in the world. It is a chordophone which produces sounds mechanically.

Medieval Chinese Emperor

The Emperor of the vast Far-Eastern empire was the lord of life and death.

Relief map of China

An introduction to the relief and hydrography of China.

Battle of Issus (333 BC)

The battle ended with the overwhelming victory of the Macedonian army over the Persian army led by Darius III.

Jellyfish

Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group of Eumetazoans.

Monsoon wind system

In summer, monsoon winds bring heavy rainfall from the ocean to the continent.

Soil pollution

This animation demonstrates the main sources of soil pollution.

Common earthworm

The anatomy of annelids is demonstrated through the example of the common earthworm.

Edible frog

This animation demonstrates the anatomy of amphibians through the example of a common species of frogs.

Oil molecule

Triglycerides containing unsaturated fatty acids are liquid at room temperature.

Oasis

Oases are areas in deserts where water is available.

Types of synovial joints

Synovial joints can be categorised by the direction of movement they allow.

Freshwater pearl mussel

A species of mollusc widespread in freshwaters.

Location of origin of livestock and crops

Domesticated animals and crops originate from various parts of the world.

Bells

The bell is a percussion instrument and an idiophone. Many types of bells exist.

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