Common carp

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

Water turbine, generator

Water turbines convert the kinetic energy of water into electric current.

Types of synovial joints

Synovial joints can be categorised by the direction of movement they allow.

Types of surface epithelium

Surface epithelia cover the external and internal surfaces of the body

Relief map of China

An introduction to the relief and hydrography of China.

Mid-latitude cyclone and anticyclone

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

Warm front, cold front

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

Underground waters

Groundwater and aquifers are types of underground waters.

El Niño

A periodic climate pattern that occurs across the tropical Pacific Ocean every five years.

Native American settlement (Crow Nation)

The Crow are Native Americans who inhabited the Yellowstone River valley.

Mallard

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

Attack of Pearl Harbor (1941)

The United States entered World War II after the devastating attack by the Japanese navy.

Dividing Space into Regions by 3 Planes

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

Oil molecule

Triglycerides containing unsaturated fatty acids are liquid at room temperature.

Maize

One of the most important monocot crops.

Patellar reflex

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

Female reproductive system (intermediate)

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

Types of bridges

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

Fat molecule

Three saturated fatty acid molecules linked to a glycerol molecule.

Sponge

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

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