Final answer:
Bacteria, Eubacteria, and Archaebacteria are related to one another as they belong to the same domain of life - prokaryotes. Eubacteria are more common and can be found in various habitats, while Archaebacteria are extremophiles that thrive in extreme environments.
Step-by-step explanation:
Bacteria, Eubacteria, and Archaebacteria are all related to one another as they belong to the same domain of life - prokaryotes. Both Eubacteria and Archaebacteria are types of bacteria and are considered prokaryotes because they lack a cellular nucleus. However, they differ in evolutionary history, genetics, metabolic pathways, and cell wall and membrane composition. Eubacteria are the more common type of bacteria and can be found in various habitats on Earth, while Archaebacteria are extremophiles that thrive in extreme environments.