taxonomy is the science of naming, defining and classifying groups of biological organisms on the basis of shared characteristics or traits.
the 3 domain system groups organism primarily based on differences based in RNA structure.
the three domains of classification are Archaea(single-cells(crenarchaeota)), bacteria(pathogenic( proteobacteria, cyanobacteria, firmicutes,chlamydiae, spirochetes))and Eukarya( multicellular and have a membrane-bound nucleus(protests, fungi, plantar,animalia)).
hopefully that helps
