The features of Archaeans that helped Woese determine that they were different than the rest of the prokaryotes was their living at extreme habitats.
Archaeans are the living organisms that live in extreme environments like hotspring or salty habitats. They are classified into three categories: Halophiles, living in salty habitats, thermophiles, living in hotsprings, and methanogens, those produce methane.
Prokaryotes are the single-celled organisms that have a primitive nucleus. They do not have a well-defined nucleus, therefore the genetic material lies openly in the cytoplasm. They do not have any cell organelles. They usually reproduce by asexual reproduction. Ribosomes in them are 70S type.
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