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The principle of stable disequilibrium.

Water is the medium for all chemical processes occurring in the biosphere. That is why the chemically pure water in the biosphere is as much a rarity as water, devoid of life. Finally, another feature of the biosphere - is its inextricable link with the cosmos in the most - with the sun.
Biosphere looms as permeated and controlled life, it formed the outer shell of the Earth, whose development is mainly determined by the constant influx of solar energy. Earth's biosphere is characterized by the presence of liquid water and the extensive development of low-temperature reactions, controlled by the action of enzymes. Biosphere produces outward shell of gas inside the planet - the "area of ​​former biospheres, or metabiosferu.
Ours, the Earth's biosphere we not compare with anything - other biospheres in the universe has not yet discovered, and the chances of their existence all decrease. Studies produced by the spacecraft showed that in Europe the ocean on Jupiter, there are patches of water the size of tens of square kilometers. In this case, the energy received from the Europe of the Sun, as must be sufficient for photosynthesis, unless, of course, is who should be accomplished. Under-ice oceans of this type also exist on Mars, Titan. So, in principle, the existence of endobiosfer not excluded on these planets.
But it is - a hypothesis, but in the meantime, our biosphere, remains unique in the solar system. And we must preserve it.