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An assumption of 14C dating is that the amount of 14C in the atmosphere has remained constant.

One limitation is that the radiocarbon technique dates only material that was once part of an animal or plant, such as bones, flesh, or wood.

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While it stays within the zircon for a period of time, being a very small atom, helium escapes the zircon within a few thousand years.

Plants take up 14C during photosynthesis, and animals acquire 14C from eating plants.

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