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Very simply, there are five basic principles to this theory:  Variation has a genetic origin (i.e.is heritable) and arises through processes such as mutation and recombination.Our hominoid line, humans, gorillas, chimpanzees and lesser apes, is one among the superfamily Hominoidea.See the taxonomic table of primates for two comparative classification shcemes.
This formed the foundation of the neo-Darwinian evolutionary theory. Natural selection, gene flow and random genetic drift (the random change in gene combinations with each generation) drive evolution, resulting in a change in gene frequencies within populations . Adaptation is genetically based and so leads to phenotypic changes that accumulate over time;  Speciation (species formation) evolves through reproductive isolation and (genetic) divergence of populations;  Genetic changes through natural selection lead to new species and eventually new taxa .The evolution of a species is linked to the environment.Adaptation is a continuous response to the environment by changeable species.