How do scientists use evidence from fossils and rocks strata to organize earths history?

Scientists use fossils and rock strata to study the relative ages of layers and determine the sequence of events in Earth's history through a method called stratigraphy. By examining the types of fossils found in different layers and correlating them with known geological events, scientists can create a timeline of the Earth's history and understand how life evolved over time. This helps them to piece together the complex puzzle of Earth's past and better understand the processes that have shaped our planet.