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Common ciliated eucaryotic unicellular organisms widespread in freshwaters.
Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.
Glands of the endocrine system secrete hormones into the blood.
The reflex triggered by the stretching of the thigh extensor muscle is the patellar reflex.
The reproductive system consists of organs which work together for the purpose of reproduction.
The cockchafer (or maybug) is a widespread bug in Europe. Its larvae, known as chafer grubs are considered a pest.
Moles are small subterranean mammals with modified, spade-like forelegs.
This animation demonstrates the anatomy of birds through the example of mallards.
The large white butterfly is a common species of butterflies, through which we demonstrate the anatomy of butterflies.
The anatomy of annelids is demonstrated through the example of the common earthworm.
Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group of Eumetazoans.
The most ancient group of animals; they live underwater, lack real tissues and body symmetry.
A widespread heterotrophic unicellular organism with constantly changing shape.
This animation demonstrates the anatomy of amphibians through the example of a common species of frogs.
This animation demonstrates how horse chestnut trees change throughout the seasons.
Types of bridges, including beam-, arch-, suspension-, cantilever and cable-stayed bridges.
Two meshing gears transmit torque during their rotational motion.
The battle ended with the overwhelming victory of the Macedonian army over the Persian army led by Darius III.
System that satisfies consumers’ demands of water supply, wastewater disposal, electricity, heat and gas supply and telecommunication.
The Emperor of the vast Far-Eastern empire was the lord of life and death.
Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.
