Teenager sex dating sites for 15 19 - Radiometric dating age of the earth

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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At the onset of the 20th century, most scientists had accepted the great antiquity of the earth, the theory of evolution and that humanity had evolved from an ape ancestor, but by 1908 the fossil evidence of early man was scarce.

Biologists included principles from genetics in evolutionary theory during the 1920s and 1930s.

africanus (Dart, 1925) (including small brained australopithecines) (see books), H.

erectus (including the Java and Peking hominids - the archetypal Missing Link) and H.

Between the mid-1930s and mid 1940s geneticists, systematists and palaeontologists collaborated to create a united approach to evolution, the "Modern Synthesis".

Ernst Mayr reduced all the hominid (human ancestor: (see hominid books)) fossil records to three species, A.

( 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 .

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