Which sequence correctly represents the standard taxonomic hierarchy from broadest to most specific?

Which sequence correctly represents the standard taxonomic hierarchy from broadest to most specific?

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

Answer: (A)

Understanding how life is organized from broad to specific helps you see how organisms are grouped by shared traits. The broadest category is Domain, which separates life into major lineages (often summarized as Archaea, Bacteria, and Eukarya). Within each domain, the next level is Kingdom, followed by Phylum, then Class, Order, Family, Genus, and finally Species. Each level narrows the set of organisms that share defining features, building a nested hierarchy from general to more precise similarities. If the order is changed by moving a higher rank after a lower one or swapping adjacent levels, it breaks the nesting that reflects how traits accumulate as you go down the tree. The sequence that correctly represents this broad-to-narrow order is Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.

Understanding how life is organized from broad to specific helps you see how organisms are grouped by shared traits. The broadest category is Domain, which separates life into major lineages (often summarized as Archaea, Bacteria, and Eukarya). Within each domain, the next level is Kingdom, followed by Phylum, then Class, Order, Family, Genus, and finally Species. Each level narrows the set of organisms that share defining features, building a nested hierarchy from general to more precise similarities. If the order is changed by moving a higher rank after a lower one or swapping adjacent levels, it breaks the nesting that reflects how traits accumulate as you go down the tree. The sequence that correctly represents this broad-to-narrow order is Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.