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Organisms at the base of the food chain that photosynthesize – for example, plants and algae – use the carbon in Earth’s atmosphere.
They have the same ratio of carbon-14 to carbon-12 as the atmosphere, and this same ratio is then carried up the food chain all the way to apex predators, like sharks.
Such scatter would constitute a geologic component, indicating that one or more of the underlying assumptions has been violated and that the age indicated is probably not valid.
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A ratio for average continental crust of about 0.72 has been determined by measuring strontium from clamshells from the major river systems.
On the other hand, meteorites that have spent most of their time in the deep freeze of outer space can provide ideal samples.
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