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Freshwater fish used as food in many parts of the world.
The reproductive system is a series of organs working together for the purpose of reproduction.
This animation demonstrates how solar energy can be utilised.
A species of mollusc widespread in freshwaters.
The oxygen cycle describes the movement of oxygen within its three main reservoirs.
A string quartet consists of four string players, it appeared in the late 18th century.
A two-stroke engine is a type of internal combustion engine with a cycle of only two (power) strokes.
This animation shows optical and radiotelescopes used in astronomical observation.
In summer, monsoon winds bring heavy rainfall from the ocean to the continent.
The cockchafer (or maybug) is a widespread bug in Europe. Its larvae, known as chafer grubs are considered a pest.
An introduction to the relief and hydrography of China.
The battle ended with the overwhelming victory of the Macedonian army over the Persian army led by Darius III.
This animation demonstrates how horse chestnut trees change throughout the seasons
The bell is a percussion instrument and an idiophone. Many types of bells exist.
Glands of the endocrine system secrete hormones into the blood.
This animation demonstrates the main sources of soil pollution.
The zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction.
Oases are areas in deserts where water is available.
Moles are small subterranean mammals with modified, spade-like forelegs.
The reflex triggered by the stretching of the thigh extensor muscle is the patellar reflex.