Why is the three domain system preferred?

The three-domain system is preferred because it provides a more accurate representation of the evolutionary relationships among organisms. By classifying life into three domains—Archaea, Bacteria, and Eukarya—it acknowledges the distinct genetic and biochemical differences between prokaryotes and eukaryotes. This system is based on molecular data, particularly rRNA sequences, which offer a clearer understanding of the phylogenetic tree of life.