When a classification is done properly (according to a consistent principle), the species will be:

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Mutually exclusive means that each species can only be classified in one category and jointly exhaustive means that all species are classified in a category. These two principles are necessary for a proper classification system. Alphabetization is not a necessary component of a proper classification, as it is merely a way of organizing the information. Enumeration, while helpful, is not necessary as long as all species are classified.

When a Classification Is Done Properly (According to a Consistent