What name is given to the remains of organisms that lived many years ago, found in rocks?

The remains of organisms that lived many years ago and are found in rocks are called "fossils." Fossils can include a variety of preserved materials, such as bones, shells, and imprints of organisms. The process of fossilization can occur in several ways, such as through permineralization, where minerals fill in the spaces within organic material, or through carbonization, where the original organic material is reduced to a carbon residue. Fossils provide valuable information about the history of life on Earth, including evolutionary changes, ancient environments, and the interactions between different species. They are essential in the field of paleontology, which studies these remains to understand the past biological and geological history of our planet.