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Fossils are actually the remains of various creatures that lived thousands or countless years back. Once these creatures passed away, they were buried in layers and layers of planet. While their flesh would certainly rot away, the more difficult components of their body, such as shells, bones, etc, would certainly remain undamaged between the layers of sediment. Now, all those years later on, those bones as well as shells can still be discovered, intact, as those layers of debris are again uncovered.