What are the three domains of the biological classification system?

The biological classification system’s three domains are Archaea, Bacteria, and Eukarya. Archaea are prokaryotic organisms that often thrive in extreme environments and have unique genetic and biochemical properties. Bacteria are also prokaryotic but are more commonly found in diverse environments and exhibit a wide range of metabolic activities. Eukarya includes all eukaryotic organisms, ranging from unicellular protists to multicellular plants, fungi, and animals. This system emphasizes genetic relationships and evolutionary history.