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Fossils are literally the remains of numerous animals that lived thousands or millions of years earlier. When these creatures died, they were hidden in layers and also layers of planet. While their flesh would rot away, the harder components of their body, such as shells, bones, etc, would certainly remain intact in between the layers of sediment. Now, all those years later on, those bones and coverings can still be discovered, intact, as those layers of debris are once more discovered.