Types of bridges

Types of bridges include beam-, arch-, suspension-, cantilever and truss bridges.

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.

Sponge

The most ancient group of animals, they live underwater, lack real tissues and body symmetry.

Knee joint

The knee joint is made up by the femur, the tibia and the kneecap.

The upper gastrointestinal tract

During swallowing food travels from the mouth cavity into the stomach.

Freshwater pearl mussel

A species of mollusk widespread in freshwaters.

Large white butterfly

The large white butterfly is a common species of butterflies, through which we demonstrate the anatomy of butterflies.

European mole

Moles are small subterranean mammals with modified, spade-like forelegs.

Administrative divisions of China

A presentation of the major administrative units of China.

ADP, ATP

ATP is the main source of energy for cells.

Jellyfish

Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group of Eumetazoans.

German alphabet game

Practice the German alphabet and form words from the letters.

Common earthworm

The anatomy of annelids is demonstrated through the example of the common earthworm.

Regular square pyramid

A regular square pyramid is a right pyramid with a square base and four triangular faces.

The Mongol Empire

The legendary Mongol ruler Genghis Khan established a huge empire through his conquests.

Surface tension

Surface tension is the property of a liquid that allows it to obtain the smallest surface area possible.

Battle of Issus (333 B.C.)

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

Types of surface epithelium

Surface epithelia cover the external and internal surfaces of the body

Axolotl

The axolotl, also known as Mexican salamander, is an amphibian species that keeps its gills even in adulthood.

The history of human migration

The migration of large human populations began in Ancient times.

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