What are the similarities and differences between eubacteria and archaebacteria?

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The differences are that archaebacteria are found under extreme conditions like volcanic vents, while eubacteria are found in neutral conditions like the human body or foods. Archaebacteria are single-celled while the eubacteria are more complex in nature. The first similarity is that they're both bacteria. They both also look very similar under a microscope. You don't notice the difference until you look at them at a sub-cellular level.

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