When scientists use logic to determine the age of one fossil compared to another what type of dating they use?

Scientists use relative dating to determine the age of one fossil compared to another. This method involves examining the layers of rock (strata) in which the fossils are found, with the principle that deeper layers are generally older than those above them. By comparing the positions of fossils within these layers, scientists can establish a relative timeline of their existence. This approach does not provide exact ages but helps to understand the sequence of events in Earth's history.