Answer :

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the action or process of classifying something according to shared qualities or characteristics.
ex: Scale is one of the classification criteria used in my geological model.

the arrangement of animals and plants in taxonomic groups according to their observed similarities (including at least kingdom and phylum in animals, division in plants, and class, order, family, genus, and species).

Example   "The classification of the platypus was one of the critical issues of the 1830s"

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