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Fossils are actually the remains of various animals that lived thousands or millions of years earlier. Once these creatures passed away, they were hidden in layers and layers of earth. While their flesh would rot away, the more challenging parts of their body, such as shells, bones, etc, would certainly stay intact between the layers of debris. Now, all those years later on, those bones as well as coverings can still be found, intact, as those layers of sediment are once again unearthed.