However, the principle of carbon-14 dating applies to other isotopes as well.
The use of various radioisotopes allows the dating of biological and geological samples with a high degree of accuracy.
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Plants take in atmospheric carbon dioxide by photosynthesis, and are ingested by animals.
So, every living thing is constantly exchanging carbon-14 with its environment as long as it lives. The carbon in its body will remain until it decomposes or fossilizes.