Our ancient ancestors - amphibians - settled the land from hydrosphere after primitive plants. They have carried away, from abyss of ocean, a piece of "native land"- sea water -inside themselves, under a skin cover. One of the proofs to this is a surprising similarity of land and sea water inhabitants in the ratio of basic chemical elements and features of their blood regulation. Within the Second World War the Soviet military surgeons successfully used the diluted sea water instead of donor blood. On western fronts such the blood substitution has received the name of a Kvinton solution. Many people have, probably, noticed, that the wound, received in sea water, is not so painful, as the same wound, got on land, though, it seems, that salty sea water should cause an intolerable pain. But, probably, the primary relationship of these two "hydrospheres"has an effect. An embryo of the man consists on 97 % of water, and at newborn its amount makes 77 % of weight. By 50 years the man is a little "dried in " and water makes only 60 % of his weight. The basic part of water - 70 % - is concentrated inside cells, and 30 % is an intercell water, which is divided into two parts: the smaller one, 7 %,- is blood and lymph (last is filtrate of blood). And the biggest part washes cells. This water is called intertisue (or intermediate). As well as in inert hydrosphere, an exchange with an external environment some kind of external circulation is carried out in our external circle. The internal hydrosphere of the man is in incessant movement.. It is clear, that health of the man depends on quality of water. Live creatures are connected with water in many ways. That is the reason, why the waterless areas are called deserts, meaning absence alive. The supreme plants can not exist without water at all. The physiological processes in them proceed only in conditions of sufficient saturation of cells with water. For achievement of this plants use the most refined devices of the adaptation, beginning with the huge system of roots for pumping out of water from ground. The necessity of water for plants is rather high, for cultural plants it is especially well investigated. So, for manufacture of 1 ton of wheat it is required 1-2 tones of water, for reception of 1 ton of a cotton 3-4 tones of water, and to collect 1 tone of rice, it is necessary to spend more than 5 tones of water. At deficiency of water for 20 % an intensity of photosynthesis is sharply reduced, and at deficiency for 50 % and higher it stops. The man has not understood all the biological features of water, and many strings connecting life to water, are still a secret for him. For example, the large number of experiences testifies an essential influence of fresh-melted water on vital activity: the birds bathe in this water in the spring, the deers and other animals wander in it with pleasure. Washing the plants with fresh melted water essentially raise crops. Use of this water for the hens and pigs drinks increases egg-laying of first and fertility of the last. The researches of fresh-melted water have shown, that it keeps an ice structure any time: microscopic crystals of ice are kept in water even at 4 °C. The physico-chemical researches have found out some rejections from usual water, in particular, it has a little bit others viscosity and dielectric permeability. Thawed water restores only in some day. The biologists have established, that water connected with protoplasm and which is included in structure of an intercell liquid, accepts an ice structure, and this testifies once again a huge role of water in maintenance of life. Involuntarily there is a question, whether a waterless life can exist? The science fiction offers various variants of such life: Ammoniac, ftorid, silicon and even metal. To what these "lifes" are closer - to a science fiction. Only chemical view at an alive substance is a view at him as at a water solution, as almost every live creature is really a water solution to some degree, and almost all chemical processes, providing vital activity, are reduced to chemical reactions in a water solution.