The document discusses taxonomy, the study of classifying and naming organisms. It does this to bring order to Earth's tremendous biodiversity. Classification is currently based on structural and chemical similarities like DNA that show how closely related organisms are. The taxonomic hierarchy consists of domains, kingdoms, phyla, classes, orders, families, genera, and species. Binomial nomenclature uses a two-word scientific name, with the genus coming first followed by the specific epithet, to uniquely identify each species.