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| | Classification - MSN Encarta |
 | | Classification, in biology, identification, naming, and grouping of organisms into a formal system based on similarities such as internal and external anatomy, physiological functions, genetic makeup, or evolutionary history. |
 | | In the classification of animals, bacteria, protists (unicellular organisms, such as amoebas, with characteristics of both plants and animals), and fungi, classes are grouped into phyla (see Phylum), while plant classes are grouped into divisions. |
 | | Classification is one of the oldest sciences, but despite its age it is still a vigorous field full of new discoveries and methods. |
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