An ant colony consist of a queen, male ants and workers.
Honeybees produce a sweet and nutritious substance, honey.
Many freshwater fishes are also popular as food.
System that satisfies consumers’ demands of water supply, wastewater disposal, electricity, heat and gas supply and telecommunication.
This animation demonstrates the main sources of air pollution: agriculture, industry and urban settlements.
Airports provide infrastructure and services necessary for aviation.
Ports must provide necessary infrastructure and services for industry and marine transport.
Gladiators were combatants who entertained audiences in fights against each other or wild animals in ancient Roman arenas.
The Emperor of the vast Far-Eastern empire was the lord of life and death.
A species of venomous snakes widespread in Europe. Its bite is rarely fatal to humans.
The battle ended with the overwhelming victory of the Macedonian army over the Persian army led by Darius III.
The animation shows the anatomy of turtles.
These excellent shipbuilders and sailors travelled great distances on the seas and rivers.
Dicotyledons have two embryonic leaves (cotyledons), while monototyledons have only one.
Long-necked herbivorous dinosaur with a robust body.
A bireme is a type of ancient warship, with a characteristic pointed bow and two decks of oars, used by many armies.
Machines powered by animals were mainly used in mills, for grinding grains.
From the 1940s, the increasingly large aircraft carriers became the masters of the oceans.
Schooners, first built in the Netherlands in the 17th century, were mainly used as merchant ships.
This animation presents the states and state capitals of Germany