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Fossils are literally the remains of different animals that lived thousands or millions of years ago. As soon as these animals died, they were hidden in layers as well as layers of planet. While their flesh would rot away, the tougher components of their body, such as shells, bones, etc, would certainly stay intact in between the layers of debris. Currently, all those years later on, those bones and coverings can still be found, intact, as those layers of sediment are once again discovered.