Micro Organisms
The endosymbiosis hypothesis provides an explanation for how

eukaryotes developed from prokayotes
protozoa developed from algae
prokaryotes developed from eukaryotes
algae developed from protozoa

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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
cytoplasmic ribosomes that are 70S
presence of a cell wall containing a characteristic outer membrane

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