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