Concept:Radio-isotope dating is a technique used to determine the age of ancient materials by measuring the decay of radioactive elements.Explanation:Radio-isotope dating measures the breakdown of unstable isotopes in rocks and organic remains.This method is mainly applied to fossils, which are the preserved remains of organisms from past geological ages.By dating the rocks or fossils, scientists can estimate when a particular species lived on Earth.Therefore, among the listed options, radio-isotope dating is used as evidence from fossil records.Answer:C. Fossil records