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The most ancient group of animals, they live underwater, lack real tissues and body symmetry.
Glands of the endocrine system secrete hormones into the blood.
This animation shows optical and radiotelescopes used in astronomical observation.
A string quartet consists of four string players, it appeared in the late 18th century.
The zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction.
The piano is one of the most popular instruments in the world. It is a chordophone which produces sounds mechanically.
The Emperor of the vast Far-Eastern empire was the lord of life and death.
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.
Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group of Eumetazoans.
In summer, monsoon winds bring heavy rainfall from the ocean to the continent.
This animation demonstrates the main sources of soil pollution.
The anatomy of annelids is demonstrated through the example of the common earthworm.
This animation demonstrates the anatomy of amphibians through the example of a common species of frogs.
Triglycerides containing unsaturated fatty acids are liquid at room temperature.
Oases are areas in deserts where water is available.
Synovial joints can be categorised by the direction of movement they allow.
A species of mollusc widespread in freshwaters.
Domesticated animals and crops originate from various parts of the world.
The bell is a percussion instrument and an idiophone. Many types of bells exist.