One of the methods used by scientists to observe the change of Earth over time is the study of life in the fossil record. The fossil record shows that life on Earth has grown increasingly complex over time. Studying this increase in complexity in the fossil record gives clues about the timing of the changes we can observe in the ocean floor.
Scientists who study early humans depend on fossil evidence to help them sort out how our ancestors evolved over time. When looking at the fossils, scientists look for clues to changes in different characteristics such as brain size, skull shape, locomotion, and jaw size.
