Body fossils are the preserved remains of the actual physical parts of ancient organisms. These can include bones, teeth, shells, and even soft tissues in rare cases. Body fossils provide valuable information about the structure, size, and sometimes the behavior of extinct species. The process of fossilization typically occurs when an organism is buried quickly after death, protecting it from decay. Over time, minerals in the surrounding sediment replace the organic material, creating a rock-like replica of the original body. This process helps scientists study the history of life on Earth, including the evolution of species like dinosaurs and marine life.