Which sequence lists the eight levels of the taxonomic hierarchy in the correct order from Domain to Species?

Which sequence lists the eight levels of the taxonomic hierarchy in the correct order from Domain to Species?

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

Answer: (A)

Classification uses a ladder from broad to specific. Domain is the broadest level, followed by Kingdom, Phylum, Class, Order, Family, Genus, and finally Species, which is the most specific. This order shows increasing specificity as you move down the levels. The sequence that follows this exact order is correct. The other options misplace one or more levels—for example, swapping the positions of Genus and Family, or moving Phylum before Kingdom—disrupting the standard progression toward species.

Classification uses a ladder from broad to specific. Domain is the broadest level, followed by Kingdom, Phylum, Class, Order, Family, Genus, and finally Species, which is the most specific. This order shows increasing specificity as you move down the levels. The sequence that follows this exact order is correct. The other options misplace one or more levels—for example, swapping the positions of Genus and Family, or moving Phylum before Kingdom—disrupting the standard progression toward species.