Fossils are essentially the remains of different animals that lived thousands or millions of years ago. As soon as these creatures passed away, they were buried in layers and also layers of earth. While their flesh would certainly rot away, the harder 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 also coverings can still be found, undamaged, as those layers of sediment are once again discovered.
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