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Fossils are essentially the remains of various animals that lived thousands or millions of years ago. Once these creatures died, they were buried in layers as well as layers of planet. While their flesh would certainly rot away, the more difficult components of their body, such as shells, bones, etc, would remain undamaged in between the layers of sediment. Now, all those years later, those bones and shells can still be found, intact, as those layers of sediment are once more discovered.