<Tr> <Td> Animalia </Td> <Td> Animalia </Td> <Td> Animalia </Td> <Td> Animalia </Td> <Td> Animalia </Td> </Tr> <P> Partial classifications exist for many individual groups of organisms and are revised and replaced as new information becomes available, however comprehensive treatments of most or all life are rarer; two recent examples are that of Adl et al., 2012, which covers eukaryotes only with an emphasis on protists, and Ruggiero et al., 2015, covering both eukaryotes and prokaryotes to the rank of Order, although both exclude fossil representatives . </P> <P> Biological taxonomy is a sub-discipline of biology, and is generally practiced by biologists known as "taxonomists", though enthusiastic naturalists are also frequently involved in the publication of new taxa . The work carried out by taxonomists is crucial for the understanding of biology in general . Two fields of applied biology in which taxonomic work is of fundamental importance are the studies of biodiversity and conservation . Without a working classification of the organisms in any given area, estimating the amount of diversity present is unrealistic, making informed conservation decisions impossible . </P> <P> Biological classification is a critical component of the taxonomic process . As a result, it informs the user as to what the relatives of the taxon are hypothesized to be . Biological classification uses taxonomic ranks, including among others (in order from most inclusive to least inclusive): Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species . </P>

What is the purpose of scientific classification system
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