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Fossils are literally the remains of different animals that lived thousands or millions of years ago. Once these creatures passed away, they were buried in layers as well as layers of earth. While their flesh would rot away, the tougher parts of their body, such as shells, bones, etc, would certainly remain undamaged in between the layers of sediment. Now, all those years later on, those bones as well as coverings can still be located, intact, as those layers of sediment are again discovered.