Fossils-Fossils are our only clues to life in the past. They help us learn about how things have changed though time.
Fossils are like a photograph of an animal at a particular point in the history of the Earth.
They also help us understand what kinds of environments existed millions of years ago. The people who study these fossils are called paleontologists. Fossils are usually smashed into sedimentary rock, which are rocks that are layered on top of each other. Fossils are animals that once lived and then died and their hard parts were preserved. Fossils can be animals, plants, shells, bones, or even eggs.