Sexual selection is a "special case" of natural selection.
Radiometric dating not only supports the geologic "evolution" of the Grand Canyon, it validates a central tenet in a much different theory of evolution - a theory introduced by Charles Robert Darwin in his 1859 publication, An important criticism of Darwin's theory of evolution was its requirement for "an almost infinite number of generations", when evidence at the time suggested earth was less than 100 million years old.
Nearly 50 years after Darwin published , research on radioactive elements in rocks provided the first reliable evidence that the earth was old enough to accommodate the evolution of complex organisms.
In 1907, Bertram Boltwood published an article describing a novel, radiometric method for determining the age of minerals - a method he used to date a rock sample at more than 2 billion years: to search the CAS databases for additional information about radiometric dating and evolution.
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Sexual selection is often powerful enough to produce features that are harmful to the individual's survival.
For example, extravagant and colorful tail feathers or fins are likely to attract predators as well as interested members of the opposite sex.
Their method, a type of radiometric dating called uranium-lead (U-Pb) dating, relies on the fact that uranium isotopes radioactively decay to form lead isotopes.
By comparing the amount of each isotope in a sample, the age of the sample can be calculated.