Advances in the molecular study of archaebacteria and eubacteria helped to know their homology and that has helped to establish progeny. By this study, it is evident that archaebacteria were separated from eubacteria very early and both probably arose from a common ancestor called progenote.
The intolerance of extreme temperature and salt indicates their growth and survival on the ancient earth.
The economic importance of methanogens is immense. They grow well in biogas fermenters and decompose cow dung and slurry into manure by releasing methane gas as a by-product. The methane gas is used for domestic purposes in gas stoves and the burning of light.
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