Have you ever seen a fossil before? Fossils are the remains of plants or animals that lived long ago. They can be bones, shells, or even footprints. Fossils are important because they help us understand what life was like a long time ago. For example, we can learn about dinosaurs and other animals that lived millions of years ago. Scientists study fossils to learn more about the past and how it has changed over time. So, the next time you see a fossil, remember that it's like a window into the past.