Fossils are so important because they are evidence of evolutional processes. When chemically tested, they can tell us what type of environment they lived in, as well as what type of climate existed where/when they lived. Their ages can be traced as well. The study of paleoclimatology uses the records of fossils (as well as other records, such as glaciers and corals), and paleoenvironments can be determined as well with the help of fossils. Learning the Earth’s past through paleontology allows a bigger picture to be seen, so that the present and future can be better understood.
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