Which Statement is TRUE of Methanogenic and Extremely Halophilic Archaea

Question

Which statement is TRUE of methanogenic and extremely halophilic Archaea?
A) The methanogens are obligate aerobes; the extreme halophiles are obligate anaerobes.
B) The methanogens are obligate anaerobes; the extreme halophiles are mostly obligate aerobes.
C) Both the methanogens and the extreme halophiles are obligate aerobes.
D) Both the methanogens and the extreme halophiles are obligate anaerobes.

Accepted Answer

Methanogenic Archaea are obligate anaerobes which produce methane as a byproduct of their metabolism. Extremely halophilic Archaea live in environments with high salt concentrations and are mostly obligate aerobes.