Chlorophyll

Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.

European honeybee

Honeybees produce a sweet and nutritious substance, honey.

Mongol Khan (13th century)

The ruler of the vast Mongol Empire was the Khan.

Southern wood ant

An ant colony consist of a queen, male ants and workers.

Comparison of real fruits and pseudofruits

The pericarp of real fruits develops from the carpel, while the pericarp of pseudofruits develops from other parts of flowers.

The history of human migration

The migration of large human populations began in Ancient times.

Milky Way

The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion stars, one of which is our Sun.

Water supply system

The water supply system provides clean and safe drinking water for the consumers.

Red deer

Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.

Traditional Eskimo lifestyle

Igloos were the typical dwellings built by Eskimos living in the Arctic zone.

System of public utilities

System that satisfies consumers’ demands of water supply, wastewater disposal, electricity, heat and gas supply and telecommunication.

NAD⁺, NADP⁺, NADPH

NAD⁺ is a coenzyme that plays an important role mainly in catabolic processes, while NADP is important in anabolic processes as hydrogen carriers.

Aztec ruler (15th century)

The Aztec Empire was a despotic, militaristic state ruled by the tlatoani.

Female reproductive system (intermediate)

The reproductive system is a series of organs working together for the purpose of reproduction.

Dividing Space into Regions by 3 Planes

Division of space by three intersecting planes in several different arrangements.

Types of surface epithelium

Surface epithelia cover the external and internal surfaces of the body

Cockchafer (Maybug)

The cockchafer (or maybug) is a widespread bug in Europe. Its larvae, known as chafer grubs are considered a pest.

Hot air balloon

A hot air balloon is a balloon aircraft which is lifted by hot air.

Battle of Issus (333 BC)

The battle ended with the overwhelming victory of the Macedonian army over the Persian army led by Darius III.

Bells

The bell is a percussion instrument and an idiophone. Many types of bells exist.

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