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Some hyperthermophilic organisms that grow in highly acidic (pH2) habitats belong to the two groups:

1. Eubacteria and archaea
2. Cyanobacteria and diatoms
3. Protists and mosses
4. Liverworts and yeasts

Correct answer: Eubacteria and archaea

Solution

Hyperthermophiles that thrive at very high temperatures and low pH are found among prokaryotes, especially certain bacteria and archaea. Eukaryotic groups like protists, mosses, liverworts, and diatoms are not the classic source of these extreme acid-heat adaptations.

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