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Male reproductive system

The reproductive system consists of organs which work together for the purpose of reproduction.

Mallard

This animation demonstrates the anatomy of birds through the example of mallards.

Volume of a tetrahedron

To calculate the volume of a tetrahedron we start by calculating the volume of a prism.

Hot air balloon

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

Warm front, cold front

Cold and warm fronts are formed where bodies of cold and warm air meet.

Common carp

Freshwater fish used as food in many parts of the world.

Cockchafer (Maybug)

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

Large white butterfly

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

Dice

Regular dice can be used for solving statistical and probability exercises.

Secondary structure of proteins

Polypeptide chains are composed of amino acids and can appear in alpha-helix or beta-sheet form.

Paramecium caudatum

Common ciliated eucaryotic unicellular organisms widespread in freshwaters.

Red deer

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

Types of gears

Two meshing gears transmit torque during their rotational motion.

Grass snake

A type of snake with a characteristic spot on its neck.

Underground waters

Groundwater and aquifers are types of underground waters.

Mid-latitude cyclone and anticyclone

Cyclones are large areas of circulating air with clouds and precipitation being formed in its centre.

Fat molecule

Three saturated fatty acid molecules linked to a glycerol molecule.

Patellar reflex

The reflex triggered by the stretching of the thigh extensor muscle is the patellar reflex.

Types of bridges

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

Two-stroke engine

A two-stroke engine is a type of internal combustion engine with a cycle of only two (power) strokes.

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