Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.
Honeybees produce a sweet and nutritious substance, honey.
The ruler of the vast Mongol Empire was the Khan.
An ant colony consist of a queen, male ants and workers.
The pericarp of real fruits develops from the carpel, while the pericarp of pseudofruits develops from other parts of flowers.
The migration of large human populations began in Ancient times.
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 water supply system provides clean and safe drinking water for the consumers.
Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.
Igloos were the typical dwellings built by Eskimos living in the Arctic zone.
System that satisfies consumers’ demands of water supply, wastewater disposal, electricity, heat and gas supply and telecommunication.
NAD⁺ is a coenzyme that plays an important role mainly in catabolic processes, while NADP is important in anabolic processes as hydrogen carriers.
The Aztec Empire was a despotic, militaristic state ruled by the tlatoani.
The reproductive system is a series of organs working together for the purpose of reproduction.
Division of space by three intersecting planes in several different arrangements.
Surface epithelia cover the external and internal surfaces of the body
The cockchafer (or maybug) is a widespread bug in Europe. Its larvae, known as chafer grubs are considered a pest.
A hot air balloon is a balloon aircraft which is lifted by hot air.
The battle ended with the overwhelming victory of the Macedonian army over the Persian army led by Darius III.
The bell is a percussion instrument and an idiophone. Many types of bells exist.