The science of classifying living things is called taxonomy. Linnaeus introduced the classification system that forms the basis of modern classification. Taxa in the Linnaean system include the kingdom, phylum, class, order, family, genus, and species. Linnaeus also developed binomial nomenclature for naming species.
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How many hours you need to spend on studying for AP tests every week is going to depend a lot on how much material you need to review and how comfortable you are with the format of the exam questions. In general, though, you should expect to study for several hours a week split over two to three sessions.
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