In the human body (as, indeed, in animals and plants), water acts as a natural solvent. Mineral salts and nutrients are dissolved in it. Water is part of blood, lymph, gastric juice and other body fluids. If there is too little or too much water in the body, homeostasis is disturbed, that is, the constant chemical composition of these fluids, their pH, which can be dangerous to health and life. For example, the dehydration of a traveler in the desert.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.