Hierarchy refers to the taxonomic classification of living organisms in successive levels of complexity. The highest rank in such a classification “Kingdom” while “species” is the lowest. Hierarchy can be classified into two types namely obligate hierarchy and intermediary hierarchy.
A taxonomical study has led to the formation of seven categories in which every living organism in the world can be categorized:
1. Species
2. Genus
3. Family
4. Order
5. Class
6. Phylum
7. Kingdom
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