Answer: The correct answer is-
Bacteria and archaea differ in the biochemical composition of their cell wall as bacteria have peptidoglycans in their cell wall whereas archaea do not have peptidoglycans.
Bacteria and archaea are the two groups of prokaryotes ( as they lack nucleus and membrane bound organelles) that occupy two distinct domains according to three domain system classification of Carl Woese.
They both are single celled, microscopic organisms. Archaea live in extremenly harsh environmental conditions ( such as hotsprings) whereas bacteria live in moderate environmental conditions.
