The first known human remains are those of Australopithecus, nearly 4.5 million years old. Other modern bone pieces correspond to Pithecanthropus, who lived 1.5 million years ago, approximately, the Neanderthals, some 150,000 years, and the Cro-Magnon, 35,000 years old. The first stage of prehistory known Stone Age. In this was the man learned to carve and polish the stones. The end of the Ice Age, around 10,000 BC, marked the beginning of the Mesolithic, a period of transition between the Paleolithic and Neolithic, during which the primitive man learned to hunt with bow and arrows, domesticating animals and farming practice rudimentary. In the Neolithic, which began in 9000 BC, humans began to cultivate grains such as wheat and barley, and grouped into villages, housing estates built with different materials: stone, logs, mud bricks, sun-dried bricks, etc.
In the United States were found human bones for the last glacial period, while in South America were found traces of primitive life in Chile, Argentina and Brazil.
Yes nuclei can be found in human beings living in conditions similar to those of primitive man, among the Berbers of Morocco, for example.