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Viking leaders were elected from tribe members by the right of blood or an act of bravery.
This animation demonstrates the anatomy of amphibians through the example of a common...
Honeybees produce a sweet and nutritious substance, honey.
Glands of the endocrine system secrete hormones into the blood.
Practise the German alphabet and form words from the letters.
The knee joint is made up by the femur, the tibia and the kneecap.
A presentation of the major administrative units of China.
Careful tooth brushing is an important part of oral hygiene.
The reproductive system is a series of organs working together for the purpose of...
Cossacks, members of independent semi-military communities, played an important role in...
This 3D scene explains the correlation between the ratio of similarity and the ratio of...
Practise the English alphabet, build words from letters.
The mosque, built in a distinctive architectural style, is the largest adobe structure in...
The zygote is the initial cell formed when two gamete cells are joined by means of sexual...
The American bison is the largest land animal in North America.
The reflex triggered by the stretching of the thigh extensor muscle is the patellar reflex.
There are various types of instruments used for measuring temperature.
Rimac Automobili's first model is known as the world's fastest production electric vehicle.
During swallowing food travels from the mouth cavity into the stomach.
ATP is the main source of energy for cells.