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Evolution & Ecology " (see its HOME PAGE .) The result is that some areas, such as the glossary are shared.Widgets Human evolution from an ancestral primate species is not a vague hypothesis, but a historical fact.Living orders of placental mammals , be it bats, humanity, whales or camels, have as their common ancestor a small insectivore creature that went through a major phase of adaptive radiation during the Early Cenozoic Era .We humans are first animals, then mammals, then primates.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.Choose: No Frames Layout Choose: Human Evolution Frames .I have integrated this web page on human evolution into an electronic text, " Nature's Holism - Holism.
Mammals and subsequently humanity may not have become dominant on earth had it not been for the global catastrophe that led to the extinction of the dinosaurs 65 million years ago.
 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 .
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.
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africanus (Dart, 1925) (including small brained australopithecines) (see books), H.