Solid, white substance, a constituent of vegetable oils and animal fats.
The building material of the cell walls and fibres of plants.
A crystalline allotrope of carbon which was discovered at the end of the 1980s.
One of the oxoacids of nitrogen. A colourless compound with a pungent odour, a strong oxidant.
Enzymes are protein molecules catalysing biochemical reactions. Their activity can be regulated.
Colourless, odourless liquid produced by dissolving carbon dioxide in water.
A white, water-soluble, sweet compound known as sugar.
Formic acid is the simplest carboxylic acid.
The two main parts of the central nervous system, the brain and the spinal cord are protected by the skull and the spinal column.
The arms are moved by flexor and extensor muscles.
Bones of the lower limbs are connected to the trunk by the pelvis.
The urinary system serves for the removal of harmful and useless materials from the body.
Oxygen carrier protein in our red blood cells.
Neurons are cells specialised for transmitting electric signals.
This animation demonstrates how an escalator works.
The name of the Russian armoured cruiser became well known during the October Revolution of 1917.
Pearls, often used as gemstones, are the by-products of certain molluscs' protective mechanisms.
During the evolution of vertebrates the relative development of brain areas has changed.
Ancient Egypt was called the ‘gift of the Nile’, since the river played an important role in the rise of Egyptian civilisation.
The limbic system plays an important role in forming emotions and in learning.