Which of the following bacteria would one find living in hot springs?

Correct answer. Thermoacidophiles favour hot and acidic environments. Archaebacteria: There are three major known groups of Archaebacteria: methanogens, halophiles and thermophiles. The methanogens are anaerobic bacteria that produce methane. They are found in sewage treatment plants, bogs and the intestinal tracts of ruminants. Ancient methanogens are the source of natural gas. Halophiles are bacteria that thrive in high salt concentrations such as those found in salt lakes or pools of sea water. Thermoacidophiles are the heat-loving bacteria found near hydrothermal vents and hot springs.