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Fossils are essentially the remains of different creatures that lived thousands or countless years earlier. Once these creatures died, they were buried in layers and layers of earth. While their flesh would certainly rot away, the tougher components of their body, such as coverings, bones, etc, would remain intact in between the layers of sediment. Currently, all those years later, those bones as well as coverings can still be found, undamaged, as those layers of sediment are again unearthed.