Micro Organisms
All of the following are features of prokaryotes except

nitrogen fixation
photosynthesis
sexual reproduction
locomotion

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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
habitats which are extreme environments with regard to acidity
absence of a nuclear membrane temperature

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