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Fossils are actually the remains of various animals that lived thousands or countless years back. Once these creatures passed away, they were buried in layers and layers of earth. While their flesh would rot away, the more difficult components of their body, such as coverings, bones, etc, would remain undamaged between the layers of sediment. Currently, all those years later on, those bones and coverings can still be discovered, undamaged, as those layers of debris are once again unearthed.