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Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group of Eumetazoans.
The most ancient group of animals, they live underwater, lack real tissues and body symmetry.
This animation demonstrates how horse chestnut trees change throughout the seasons
Three saturated fatty acid molecules linked to a glycerol molecule.
The oxygen cycle describes the movement of oxygen within its three main reservoirs.
One of the positive influences of the Ottoman invasion of Europe was the construction of baths.
Widespread heterotrophic unicellular organisms with constantly changing shapes
The phosphorus cycle describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.
This animation demonstrates the anatomy of amphibians through the example of a common species of frogs.
Viking leaders were elected from tribe members by the right of blood or an act of bravery.
One of the most important monocot crops.
Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.
A type of snake with a characteristic spot on its neck.
The Emperor of the vast Far-Eastern empire was the lord of life and death.
Cold and warm fronts are formed where bodies of cold and warm air meet.
This animation shows optical and radiotelescopes used in astronomical observation.
A string quartet consists of four string players, it appeared in the late 18th century.
Glands of the endocrine system secrete hormones into the blood.
The piano is one of the most popular instruments in the world. It is a chordophone which produces sounds mechanically.
The zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction.