DENDROLOGY

Detailed explanation-1: -Model organisms for genetics in the domain Archaea: methanogens, halophiles, Thermococcales and Sulfolobales.

Detailed explanation-2: -Archaea that live in salty environments are known as halophiles. Archaea that live in extremely hot environments are called thermophiles. Archaea that produce methane are called methanogens. Archaea are known for living in extreme environments, but they also can be found in common environments, like soil.

Detailed explanation-3: -Over time, many halophilic and thermophilic microorganisms have found their home in the archaeal domain.

Detailed explanation-4: -Methanogens are distinguished from bacteria and archaea that may produce methane as a byproduct of metabolism by their obligate need to synthesize methane to conserve energy using the Wolfe Cycle [8]. By this distinction, all known methanogens, to date, belong to the euryarchaeal domain.

Detailed explanation-5: -Many archaea colonize extreme environments. They include hyperthermophiles, sulfur-metabolizing thermophiles, extreme halophiles and methanogens.