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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Micro Organisms
Genetic and biochemical similarities between contemporary cyanobacteria and eukaryotic chloroplasts are accepted to mean that

cyanobacteria arose from chloroplasts which escaped from plant cells
eukaryotes evolved from bacteria
eukaryotes evolved from archaea
oxygenic photosynthesis first evolved in eukaryotes

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