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These skeptics do not provide scientific evidence for their views.
Current understanding of the history of life is probably close to the truth because it is based on repeated and careful testing and consideration of data.
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This paper reviews the possible approaches for dating of human bones and teeth, older than 500,000 years.
Skeletal tissues can, in principle, be dated with an open-system U-series approach, which requires that the Th/U activity ratio is still below equilibrium.
Lastly, a combination of ESR and U-series analyses can be used in ideal circumstances for dating teeth up to several millions of years of age.
Our understanding of the shape and pattern of the history of life depends on the accuracy of fossils and dating methods.
The horse tooth from Fuente Nueva III, for example, was definitely not suitable for D-A dating.