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Fossils are literally the remains of different creatures that lived thousands or millions of years back. As soon as these creatures died, they were buried in layers and layers of earth. While their flesh would certainly rot away, the tougher components of their body, such as shells, bones, etc, would remain intact in between the layers of sediment. Currently, all those years later on, those bones and also coverings can still be discovered, undamaged, as those layers of debris are again discovered.