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

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

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

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

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