Which statement lists the correct order from broadest to most narrow in scientific classification?

• A. Kingdom, Phylum, Class, Order, Family, Genus, Species
• B. Kingdom, Class, Phylum, Order, Family, Genus, Species
• C. Kingdom, Phylum, Class, Order, Family, Species, Genus
• D. Domain, Kingdom, Phylum, Class, Order, Family, Genus

Answer: (A)

Understanding how taxonomic ranks stack from broad to narrow helps you see how organisms are related. In the traditional Linnaean ordering, the broadest category listed is Kingdom, followed by Phylum, then Class, then Order, then Family, then Genus, and finally Species. Each step narrows the group: Phylum groups organisms by major body plans, Class tightens those groupings, Order further refines, Family brings in closer relatives, Genus includes very similar species, and Species identifies the most specific unit that can interbreed and share defining traits.

Some systems extend this with Domain as the broadest rank, which would place Domain above Kingdom, but that option isn’t completed in the set with a full, correct sequence down to Species. The sequence that goes Kingdom, Phylum, Class, Order, Family, Genus, Species matches the traditional broad-to-narrow order and is the best choice among the provided statements.