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The C14 will undergo radioactive decay, and after 5730 years, half of it will be gone. So, if we find such a body, the amount of C14 in it will tell us how long ago it was alive. The method doesn't work on things which didn't get their carbon from the air.This leaves out aquatic creatures, since their carbon might (for example) come from dissolved carbonate rock.For example, Stonehenge suddenly became older than the Pyramids, instead of younger.Since then, several other calibrations have been done, which confirm and extend the tree-ring one.
Also, humans are now burning large amounts of "fossil fuel". It is produced in the upper atmosphere by radiation from the sun.(Specifically, neutrons hit nitrogen-14 atoms and transmute them to carbon.) Land plants, such as trees, get their carbon from carbon dioxide in the air. The same is true of any creature that gets its carbon by eating such plants. Suppose such a creature dies, and the body is preserved.If you hear of a living tree being dated as a thousand years old, that is not necessarily an example of an incorrect dating. Wood taken from the innermost ring really is as old as the tree. We can date things for which historians know a "right answer".And, we can date things that have been dated by some other method.