Weegy: The current system, the Three Domain System, groups organisms primarily based on differences in ribosomal RNA structure. [ Ribosomal RNA is a molecular building block for ribosomes.
Under this system, organisms are classified into three domains and six kingdoms. The domains are Archaea, Bacteria, and Eukarya. The kingdoms are Archaebacteria (ancient bacteria), Eubacteria (true bacteria), Protista, Fungi, Plantae, and Animalia
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