Which of the following groups in the Domain Archaea require high salt concentrations for survival?

hyperthermophiles

halophiles

Archaezoa

methanogens

The correct answer is: halophiles

Halophiles on Greek means "salt-loving", so organisms that belong to this group are extremophiles (survive in extreme environment) that live in high salt concentration. Halophiles usually belong to Archaea, but can be found in Bacteria domain and sometimes even Eukarya.

Halophiles can survive on very salty environments (with a concentration of salt that is five times greater than the salt concentration of the ocean.