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Fossils are essentially the remains of various animals that lived thousands or millions of years back. When these creatures died, they were buried in layers and layers of planet. While their flesh would rot away, the harder components of their body, such as coverings, bones, etc, would certainly stay undamaged in between the layers of debris. Currently, all those years later, those bones and coverings can still be discovered, intact, as those layers of sediment are once again unearthed.