Which term is used to describe the broadest category that groups together all life?

Which term is used to describe the broadest category that groups together all life?

• A. Kingdom
• B. Phylum
• C. Class
• D. Domain

Answer: (D)

Domain is the broadest category used today to group all life. It recognizes three fundamental lineages—Bacteria, Archaea, and Eukarya—that differ greatly at the genetic and cellular level. Domains sit above kingdoms, so kingdoms are subdivisions within a domain, while phylum and class are much more specific ranks nested within kingdoms. In older systems there were five kingdoms, but the domain level remains the highest taxonomic rank for all organisms.

Domain is the broadest category used today to group all life. It recognizes three fundamental lineages—Bacteria, Archaea, and Eukarya—that differ greatly at the genetic and cellular level. Domains sit above kingdoms, so kingdoms are subdivisions within a domain, while phylum and class are much more specific ranks nested within kingdoms. In older systems there were five kingdoms, but the domain level remains the highest taxonomic rank for all organisms.