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