A string quartet consists of four string players, it appeared in the late 18th century.
One of the positive influences of the Ottoman invasion of Europe was the construction of baths.
Every era and every culture has specific residential buildings.
The three main types of blood vessels in the human body are the arteries, the veins, and the capillaries.
The water supply system provides clean and safe drinking water for the consumers.
The river and marine sailing boats of ancient Egypt were one-masted, oared boats
The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion stars, one of which is our Sun.
The reproductive system is a series of organs working together for the purpose of reproduction.
A game to practise the use of analogue and digital clocks.
Careful tooth brushing is an important part of oral hygiene.
The migration of large human populations began in Ancient times.
A fjord is a long, narrow inlet with steep sides, created in a valley carved by glacial activity.
The last Ice Age ended about 13 thousand years ago.
NAD⁺ is a coenzyme that plays an important role mainly in catabolic processes, while NADP is important in anabolic processes as hydrogen carriers.
ATP is the main source of energy for cells.
A geyser is a spring characterised by intermittent discharge of water and steam.
The Byzantine Emperor was the head of the Byzantine Empire, the direct continuation of the Roman Empire.
During swallowing food travels from the mouth cavity into the stomach.
The knee joint is made up by the femur, the tibia and the kneecap.
A type of snake with a characteristic spot on its neck.