To calculate the volume of a tetrahedron we start by calculating the volume of a prism.
Synovial joints can be categorised by the direction of movement they allow.
Regular dice can be used for solving statistical and probability exercises.
Surface epithelia cover the external and internal surfaces of the body
Water turbines convert the kinetic energy of water into electric current.
Viking leaders were elected from tribe members by the right of blood or an act of bravery.
Domesticated animals and crops originate from various parts of the world.
The reproductive system consists of organs which work together for the purpose of reproduction.
This animation demonstrates the anatomy of birds through the example of mallards.
Freshwater fish used as food in many parts of the world.
Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.
Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.
This animation demonstrates the main sources of soil pollution.
In summer, monsoon winds bring heavy rainfall from the ocean to the continent.
The large white butterfly is a common species of butterflies, through which we demonstrate the anatomy of butterflies.
The cockchafer (or maybug) is a widespread bug in Europe. Its larvae, known as chafer grubs are considered a pest.
The oxygen cycle describes the movement of oxygen within its three main reservoirs.
The phosphorus cycle describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.
Moles are small subterranean mammals with modified, spade-like forelegs.
The Incas´ rudimentary weapons were inadequate in their struggle against the Spanish Conquistadors.