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Fossils are literally the remains of various animals that lived thousands or countless years ago. Once these animals died, they were hidden in layers as well as layers of planet. While their flesh would certainly rot away, the harder 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 and shells can still be discovered, intact, as those layers of debris are once again discovered.