Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group of Eumetazoans.
A type of snake with a characteristic spot on its neck.
A game to practise the use of analogue and digital clocks.
A two-stroke engine is a type of internal combustion engine with a cycle of only two (power) strokes.
The Emperor of the vast Far-Eastern empire was the lord of life and death.
The three main types of blood vessels in the human body are the arteries, the veins, and the capillaries.
Triglycerides containing unsaturated fatty acids are liquid at room temperature.
Domesticated animals and crops originate from various parts of the world.
This animation demonstrates the main sources of soil pollution.
The anatomy of annelids is demonstrated through the example of the common earthworm.
Polypeptide chains are composed of amino acids and can appear in alpha-helix or beta-sheet form.
Glands of the endocrine system secrete hormones into the blood.
A species of mollusc widespread in freshwaters.
A string quartet consists of four string players, it appeared in the late 18th century.
The zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction.
Moles are small subterranean mammals with modified, spade-like forelegs.
The reflex triggered by the stretching of the thigh extensor muscle is the patellar reflex.
Viking leaders were elected from tribe members by the right of blood or an act of bravery.
One of the most important components of the microwave oven is the magnetron, which produces the microwaves.
An ancient Greek myth about the tragedy of father and son who wanted to flee the island of Crete.