Question

define hierarchy of classification

Answer 1

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In biology, hierarchy refers to the taxonomical classification of living organisms in successive levels of complexity. ... The meaning of hierarchy is the arrangement of the categories in an increasing order from species to the kingdom or in a decreasing order from kingdom to species.
A hierarchical system is used for classifying organisms to the species level. This system is called taxonomic classification. 

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Answer 2

Hierarchy means arrangement of things according to their ranks. Organisms aregroup in various hierarchical levels on the basis of the similar characteristics. This is known as taxonomic hierarchy. The highest level of classification of the living things is Kingdom and the lowest level is species . A kingom is divided into phyla and division. Phyla/Divison are composed of classes. Each class is divided into orders which are further divided into family. A family consists of many genera and each genus has several species .