Common ciliated eucaryotic unicellular organisms widespread in freshwaters.
Freshwater fish used as food in many parts of the world.
This animation demonstrates the anatomy of birds through the example of mallards.
The reproductive system consists of organs which work together for the purpose of reproduction.
Surface epithelia cover the external and internal surfaces of the body
A species of venomous snakes widespread in Europe. Its bite is rarely fatal to humans.
Groundwater and aquifers are types of underground waters.
Synovial joints can be categorised by the direction of movement they allow.
Domesticated animals and crops originate from various parts of the world.
The reflex triggered by the stretching of the thigh extensor muscle is the patellar reflex.
Cold and warm fronts are formed where bodies of cold and warm air meet.
The zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction.
This animation demonstrates the structure and operation of digital cameras.
Glands of the endocrine system secrete hormones into the blood.
Cyclones are large areas of circulating air with clouds and precipitation being formed in its centre.
Water turbines convert the kinetic energy of water into electric current.
The large white butterfly is a common species of butterflies, through which we demonstrate the anatomy of butterflies.
The Emperor of the vast Far-Eastern empire was the lord of life and death.
Division of space by three intersecting planes in several different arrangements.
This animation demonstrates the geographical locations of the Earth's major cities.