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When it comes to fossil records, all of the fossils of one geological era are contained in one strata (Layer) of rock. The fossil record does not only contain animal fossils. It also contains fossils of the different flora of the region, thus dictating the type of environment. If you know what kind of environment was around then you will know what type of skills a species of animal would need to survive. Therefore as you look through newer layers you can see how a certain species have changed over time to adapt to their environment.

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