List the classification system from top-down (kingdom to species).

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

Answer: (D)

The idea being tested is how the standard taxonomic ranks run from broad to specific. From kingdom down to species, the order is Kingdom, Phylum, Class, Order, Family, Genus, Species. This structure groups organisms first into large, general categories and then narrows down to the most specific groupings, with species being the most precise classification. In many modern classifications, Domain sits above Kingdom, but since the prompt starts at Kingdom, Domain isn’t included here. The sequence Kingdom → Phylum → Class → Order → Family → Genus → Species matches the expected hierarchy. For example, humans are classified as Kingdom Animalia, Phylum Chordata, Class Mammalia, Order Primates, Family Hominidae, Genus Homo, Species Homo sapiens.