Question: what is the main characteristics of the six kingdoms?
Answer: Archaebacteria. Archaebacteria are the most recent addition to the kingdoms of organisms. ... 
Eubacteria. Eubacteria are also single-celled bacterial organisms. ... 
Fungi. The Fungi kingdom is recognizable to us as mushrooms, molds, mildews and yeasts. ... 
Protista. ... 
Plants. ... 
Animals.