Explain the characteristics scientists use when
observing organisms and placing them in the six
kingdoms

Classification of organisms is done while considering many factors such as:Cell type- whether the organism is prokaryotic or eukaryoticCell structure- This includes both the presence and composition of the cell wallBody type- whether the organism is multicellular or unicellularMode of nutrition- the method through which the organism achieves its nutritional requirement, by consuming other organisms (heterotroph) or making its own food (autotroph)

not sure if this is what you'r looking for eubacteria and archaebacteria