Ayr and his benefit
Air is a genus of evergreen herbaceous plants, which includes from 2 to 6 species (according to different sources). There are these useful plants in various humid places: on the…

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Caves and their peculiarities
A cave is a natural cavity in the upper layer of the earth's crust, which has at least one exit to the surface. Sometimes caves are the most complicated systems…

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Wolves are dangerous predators
Wolves are a kind of dangerous predatory mammals belonging to the dog family. Due to their habits, appearance, strength and cleverness, they are very famous animals. By the way, dogs…

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have a cellular

Viruses and viral diseases

The virus is an infectious agent that does not have a cellular structure, and is capable of reproducing only within cells of living organisms. For this they are referred to obligatory parasites.
They exist wherever there is life. And they are at the same time the most numerous form of life. Their study is practiced by science of virology. Continue reading

Pollution of reservoirs
Water pollution is a serious environmental problem. Indeed, water is essential for the existence of all living organisms, including humans. But its contamination makes it impossible to use water for…

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Plain roach
Roach is a very common fish belonging to the family of carp. Other names of this species - vobla, ram, chebak, squire, fence. And it has such a large variety…

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