Humans were essentially hunters and gatherers. They had developed the use of fire. B â¦ ut they did not live a settled existence, instead following herds of animals on their migrations which were their primary source of food. Men were the hunters and responsible for the group's primary food source.
Emf - is the amount of energy of any form that is changed into electrical energy per coulomb of charge. pd - is the amount of electrical energy that is changed into other forms of energy per coulomb of charge. Sources of emf: Cell, battery (a combination of cells), solar cell, generator, dynamo, thermocouple.
We suggest that the adaptation of tissues to the EMFs, in genetically predisposed subjects, may stimulate the onset and progression of autoimmune diseases. Electromagnetic fields (EMFs) are produced by geo-magnetic and environmental activities, industrial, domestic and therapeutic uses as well as by cell metabolism.