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Fossils are actually the remains of numerous animals that lived thousands or millions of years back. Once these creatures died, they were buried in layers and also layers of earth. While their flesh would rot away, the more difficult components of their body, such as coverings, bones, etc, would certainly stay intact between the layers of sediment. Currently, all those years later, those bones as well as coverings can still be discovered, intact, as those layers of debris are again unearthed.