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Fossils are literally the remains of different creatures that lived thousands or millions of years earlier. Once these animals passed away, they were buried in layers as well as layers of planet. While their flesh would certainly rot away, the harder components of their body, such as coverings, bones, etc, would certainly remain intact in between the layers of sediment. Now, all those years later, those bones and shells can still be found, undamaged, as those layers of debris are once more unearthed.