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

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

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

cytoplasmic ribosomes that are 70S
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

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