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( Adaptive radiation is the evolution from an unspecialised ancestral stock of many different species that adapt to a variety of ecological roles (see books)).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.This environment has a living (other animals) and non-living component (e.g. Widgets A unique adaptation usually precedes the entry into a new niche .Tool use by our early ancestors is one such adaptation.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.
Without the universal acceptance of the principle of evolution, there is no chance for the serious proposal of holism.Once multicellular organisation became possible as atmospheric oxygen levels rose, the early multicellular organisms rapidly diverged into many adaptive forms.Mass extinction events and an organism's unique adaptations mark the history of evolution, both of which may lead to adaptive radiation.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.