The urinary system serves for the removal of harmful and useless materials from the body.
Oxygen carrier protein in our red blood cells.
Paper was invented more than two thousand years ago.
Eurypterids are an extinct group of Palaeozoic aquatic arthropods.
Oil tankers appeared in the late 19th century; today they are among the largest ships.
Cosmopolitan monocots inhabiting watersides.
Modern Slavs live in 14 European countries that can be classified into 3 groups.
Neurons are cells specialised for transmitting electric signals.
The cathedral named after the Assumption of Mary into Heaven is one of the gems of French Gothic architecture.
The limbic system plays an important role in forming emotions and in learning.
The first indoor theatre in modern history to be constructed according to the theatre-building codes of Antiquity was inaugurated in 1585.
The Arctic tern is famous for its long migration route: it flies from the Arctic to the Antarctic and back again each year.
The architecture of traditional Samoan family settlements reflect the unique culture of their inhabitants.
This Neoclassical structure is one of the best-known landmarks of Berlin and Germany.
Limestone is a widely and diversely used material.
During the substitution reaction the hydrogen atoms of methane are substituted with chlorine atoms, the by-product is hydrogen chloride.
Fatty acid molecules consist of a polar head and a non-polar tail, therefore they are suitable for removing fat stains.
Hydrogen atoms within hydrogen molecules are held together by a covalent bond.
The device designed to carry out executions more humanely than before was named after a French doctor.
Jamestown, founded in 1607, was the first permanent English settlement on the east coast of North America.