Explain the importance of the binomial name for a species.

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The system of naming biological species that you are referring to is called binomial nomenclature.  This system was first used by biologist Carl Linnaeus in the mid-18th century.  The binomial system is used because it helps impart a higher degree of specificity to an organism in its name to help eliminate confusion or require additional information to be added.  The first word of the name is the genus of the organism and the second word of the name is the species of the organism.  Both words are usually derived from Latin.  The first word is capitalized, the second word is not capitalized, and both words are italicized.

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