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Dating methods are classified into relative and absolute dating.
Relative dating is a science which deals with the comparative study of events from the past.
This is because all living plants and animals take in radioactive carbon-14 from the environment but as soon as they die they stop taking in carbon-14 and the amount that they had in them starts to decay and turn into the stable carbon-12 isotope.
And this happens at a known, constant and predictable rate.