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Answer:
Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages. Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it.
because geologists can estimate the ages of the rock layers based on particular index fossils they contain. we learned how geologist examine rocks (and fossils) to determine relative age and absolute age. we can then estimate earths past events such as the continental drift.