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Fossils are actually the remains of different creatures that lived thousands or numerous years ago. When these creatures died, they were hidden in layers and also layers of planet. While their flesh would rot away, the tougher components of their body, such as shells, bones, etc, would certainly stay undamaged between the layers of debris. Now, all those years later, those bones and shells can still be found, intact, as those layers of sediment are again unearthed.