Explanation

Archaebacteria is a primitive group of bacteria The three main groups of archaebacteria are methanogens, halophiles and thermoacidophiles. Methanogens are found in the musk of swamps and marshes, the rumen of cattle, sewage, sludges and gut of termites Halophiles are named so because they usually occur in salt rich substrata like salt pans, salt beds and salt marshes Thermoacidophiles have dual ability to tolerate high temperature as well as high acidity. They often live in hot sulphur springs where the temperature may be as high as $80℃$. and pH as low as 2