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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.
Carbon-14 has a half-life of 5,730 ± 40 years—, half the amount of the radioisotope present at any given time will undergo spontaneous disintegration during the succeeding 5,730 years.
The resulting C-14 is unstable and decays back to N-14 with a measured half-life of approximately 5,730 years.
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I have integrated this web page on human evolution into an electronic text, " Nature's Holism - Holism.
Scientists now have accurate methods (see below ) for dating fossils.
methods rely on characteristic faunal and geological patterns to bracket the period when the fossil existed.
Carbon-14 is continually formed in nature by the interaction of neutrons with nitrogen-14 in the Earth’s atmosphere; the neutrons required for this reaction are produced by cosmic rays interacting with the atmosphere.