Answer :
prototype theory. Kendra only classifies an animal as a fish if it swims, lays eggs, and has gills. necessary & sufficient conditions.
In cognitive science, particularly in psychology and cognitive linguistics, the prototype theory is a categorization theory that holds that there are various degrees of belonging to a conceptual category and that some members are more central than others. It was created by psychologist Eleanor Rosch, and the theory of categorization employed it for the first time in 1971. It has been referred to as a "Copernican revolution" because it deviates from conventional Aristotelian categories. Supporters of the structural semantics paradigm, such as linguist Eugenio Coseriu, have debated others who continue to hold to the traditional idea of categories.
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