The harm and the benefit of aloe
Aloe - a family of succulent plants, numbering more than 500 species. Of course, far from all of them have medicinal properties. However, some species, common in the Russian-speaking countries,…

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Role of rivers in nature
The river is a significant amount of water flow flowing along the channel (deepening in the earth's surface) from the source (the beginning of the river) to the mouth (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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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

Blood-sucking mosquitoes
Mosquitoes are a family of flying blood-sucking insects. For this feature they also received another name - Bloodsucking mosquitoes, although usually it is reduced. Apart from the fact that these…

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World ocean and its properties
The ocean covers about 70% of the surface of our planet. Thus, it is an aquatic membrane, stretched almost all over the surface of the Earth. The oceans are continuous,…

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