The life of man is in the closest connection with the geochemistry and biochemistry of surrounding environment. Absence of food or other trace element leads to disruption of normal metabolism, and in case of a prolonged process - to severe hereditary diseases.
The emergence of a number of epidemic diseases occur as a result of the depletion of soil, depleted continuous plowing, and her disappearance in trace elements, essential for the human body.
Therefore, the more intense agricultural activity of the sedentary population, the greater the changes the environment, specific to each area a set of plant and animal communities.
