Explain the three-domain system of classification.
The three-domain system was introduced by Carl Woese based on molecular evidence, especially ribosomal RNA sequencing. The three domains are: Bacteria: Prokaryotic, have peptidoglycan cell walls, reproduce by binary fission (e.g., E. coli). Archaea: Prokaryotic but distinct from bacteria, lack peptidoglycan, live in extreme environments (e.g., Methanogens). Eukarya: Eukaryotic, includes Protists, Fungi, Plantae, and Animalia … Read more