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Common carp

Freshwater fish used as food in many parts of the world.

Female reproductive system (intermediate)

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

Freshwater pearl mussel

A species of mollusc widespread in freshwaters.

Oxygen cycle

The oxygen cycle describes the movement of oxygen within its three main reservoirs.

String quartet

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

Two-stroke engine

A two-stroke engine is a type of internal combustion engine with a cycle of only two (power) strokes.

Telescopes

This animation shows optical and radiotelescopes used in astronomical observation.

Monsoon wind system

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

Cockchafer (Maybug)

The cockchafer (or maybug) is a widespread bug in Europe. Its larvae, known as chafer grubs are considered a pest.

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.

Horse chestnut

This animation demonstrates how horse chestnut trees change throughout the seasons

Bells

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

Endocrine system

Glands of the endocrine system secrete hormones into the blood.

Soil pollution

This animation demonstrates the main sources of soil pollution.

Gametes

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

Oasis

Oases are areas in deserts where water is available.

European mole

Moles are small subterranean mammals with modified, spade-like forelegs.

Patellar reflex

The reflex triggered by the stretching of the thigh extensor muscle is the patellar reflex.

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