Human evolution is a long process which is well characterized by the support of the extinction, dispersal events and other speciation, Hence it linked to regional palaeoclimate records and another world. On the other hand, it guides to the emergence of modern humans by automatically and it is beginning the evolutionary history of the genus homo and primates. Here the study of the human evaluation engage with the number of the scientific disciplines such as
- Evolutionary Psychology
- Physical Anthropology
A number of theories well proposed to link with major environmental changes to the respective human evolution events.
With the environment, pressures had assumed to play an important role in the part of the hominin speciation and also provide adaptation. There are many iconic theories developed to frame as well as improve the discussion of the current hominin evolution. Savannah hypothesis is first and foremost important aspects of environment theory to explain and it is well suggested which hominines’ get required to reduce from trees as well adapted to life on the savannah facilitated with the two feet. Hence this theory becomes well refined as an aridity hypothesis and it is recommended at the time of the acidification accelerated and owing in the world climate systems. The threshold in evolution is well reached and also a number of the hominin speciation event when it occurred.
Turnover pulse hypothesis
It is well developed to show off the discrete patterns in the part of the ungulate speciation. Then Vrba has well recognized the environment which brings extinctions hurt specialist species that the other generalist species. If there is an environment disruption, then the respective generalist tends to increase by using the fresh environment chance. Most of the experience people can have enjoyed more extinction and increase the rate among their group. Therefore it assists to get faster evolution on the part of the isolated areas such as the allopathic speciation. But the generalist becomes widely spread out in faster manner among the world.
Variability selection hypothesis
It is advocated main role of the environment unpredictability in the part of the choosing the behavioral. This theory improves the real turnover pulse hypothesis but rather than split species in the apart of the different ability to hold and evolve to the different number of the unpredictable environment as well as variable. This theory becomes long terms ideas towards variable climate and drier. However, it is hard to provide an explanation to the palaeoanthropological proof which is recommended to the pulsed, migration events in winning way.
Recent research said that the period of the climate stability become equally important in the providing the driving human evolution, newly technological innovation, and other dispersals in a fine manner. At the same time, the longtime of climate stability can invoke the sympatric evolution due to the sexual selection. Hence the Red queen hypothesis recommends continuing adaptation which required for ordering the species to maintain a relative fitness to the coevolving systems.