Some hyperthermophilic organisms that grow in highly acidic ( pH 2 ) habitats belong to the two groups called

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Thermophiles live in very hot places, typically from 60^ to 80^ C . Many thermophiles (some eubacteria and archaebacteria) are autotrophs and have metabolisms based on sulphur. Some thermophilic archaebacteria form the basis of food webs around deep-sea thermal vents, where they must withstand extreme temperature and pressures. Archaebacteria can grow in highly acidic ( pH =0.7) and very basic ( pH =11) environments.