A fosszilis, or fossil, is the preserved remains or traces of ancient organisms, typically found in sedimentary rocks. These remnants can include bones, shells, imprints, or even traces of behavior, like footprints. Fossils provide valuable information about the history of life on Earth and how species have evolved over millions of years. The process of fossilization usually occurs when an organism is buried quickly after death, protecting it from decay. Over time, minerals in the surrounding sediment replace organic material, creating a fossil. Fossils are crucial for understanding paleontology, the study of ancient life, and help scientists reconstruct past environments and ecosystems.