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Fossils are the preserved remains, impressions, or traces of any once-living organism from a past geological age. They range in size from microscopic bacteria to large dinosaurs and trees. Fossils are studied by paleontologists to understand the history of life on Earth. The fossil record provides evidence for the process of evolution, showing how species have changed over time. Transitional fossils exhibit traits of both ancestral and descendant groups, demonstrating the gradual nature of evolution. Fossils can be preserved through various processes like permineralization, casting and molding, and compression. In rare cases, even soft tissues and biomolecules can be preserved in fossils. The fossil record has been extended back billions of years, with the earliest known fossils being microscopic bacteria. Fossils have also influenced the mythology and folklore of many ancient civilizations around the world. P. Geo. Ricardo A Valls, M. Sc. Valls Geoconsultant ORCID ID- https://orcid.org/0000-0002-5421-0914 Scopus Author ID: 7003369619/35335510700 ResearcherID: S-6604-2018 If you like this content, please "buy me a coffee" https://www.buymeacoffee.com/goldendroplets