Micro Organisms
The three domain version of life on earth is based on the

morphological traits
metabolic traits
characteristics of the cell wall
nucleic acid sequence data

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Micro Organisms
The unifying feature of the archaea that distinguishes them from the bacteria is

cytoplasmic ribosomes that are 70S
presence of a cell wall containing a characteristic outer membrane
absence of a nuclear membrane temperature
habitats which are extreme environments with regard to acidity

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