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The hierarchy of biological classification's eight major taxonomic ranks, which is an Biological classification, or scientific classification in biology, is a method by which. — “Biological classification - Wikipedia, the free encyclopedia”, en.wikipedia.org
Two types of containment hierarchies are the subsumptive containment hierarchy and the compositional containment hierarchy. A subsumptive hierarchy can also be defined abstractly as a hierarchy. — “Hierarchy - Wikipedia, the free encyclopedia”, en.wikipedia.org
Category theory is an area of study in mathematics that examines in an abstract way the objects and arrows (also called morphisms, although this term also has a specific, non. — “Category theory - Wikipedia, the free encyclopedia”, en.wikipedia.org