What would happen if you added elements to fossils or whatever you are dating?

Solution (rephrased): Radiometric dating is a method used to estimate the age of fossils or rocks. It assumes that the radioactive elements measured remain unchanged over time, except for decay. Adding elements to fossils during dating disrupts this assumption and results in incorrect age estimates. Natural rock cycles can lead to this problem when a radioactive element becomes re-set by weathering and erosion. Scientists are aware of this and mitigate it by using multiple age dates on different samples from different locations when possible. They also apply different radiometric techniques, such as U-Pb and Rb-St, to ensure the dates are consistent. If there is significant variation in dating results, this indicates an issue with the data.