One can easily understand the difficulty scientists to rewrite the history of man, as the task is huge and impossible. It is as if we were to reconstruct the history of modern civilization in Europe, from a Gallo-Roman pottery and a lighter. That is why, all his theories are not very convincing. The theses of the savannah, the transport of food, life on the edge of the shore and the others are probably false. It is likely that this property human bipedalism, is not related to an event but to multiple factors that we will never know. But man is standing because it is a monkey and up and down trees or hanging monkey has a vertical station, so why seek an explanation for bipedalism other than trees. It was enough to hominid just down from the trees to be bipedal .
The Meerkats walk on their hind legs to see far, and monitor the arrival of predators and yet they have not adopted this means of locomotion. Chimpanzees temporarily adopt bipedalism to carry food or use a tool and yet they have not evolved into what one means of locomotion. Of course that man is an inhabitant of the shores, half of humanity lives on the edge of the water, water is vital to all living organisms.
According to the famous materialist archaeologist Professor V. Gordon Childe, “The latter (Morgan) had collected data of just the kind suited for illustrating the Materialist conception of history. The criteria he used for distinguishing between savagery, barbarism, and civilisation, if not precisely ‘forces of production’ – still less ‘modes of production’ – at least approximated more closely thereto than the criteria expounded by any other school at that time.” Childe concludes: “In the end Engels succeeded brilliantly in correlating the transition from one ‘status’ to the next in Morgan’s scheme with changes in the productive forces at the disposal of society.” 4
Evolution does not change any single individual. Instead, it changes the inherited means of growth and development that typify a population (a group of individuals of the same species living in a particular habitat). Parents pass adaptive genetic changes to their offspring, and ultimately these changes become common throughout a population. As a result, the offspring inherit those genetic characteristics that enhance their chances of survival and ability to give birth, which may work well until the environment changes. Over time, genetic change can alter a species' overall way of life, such as what it eats, how it grows, and where it can live. Human evolution took place as new genetic variations in early ancestor populations favored new abilities to adapt to environmental change and so altered the human way of life.