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

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

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

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

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