Why are archaea in a different domain from bacteria?

Archea is considered as the different domain of life in prokaryotes, as they are the most primitive type and known as the ancient microbes found in extreme niches such as hydrothermal vents, higher salt concentration, high temperature, and pressure etc. They also have morphological differences other than bacteria which are rarely to be seen in those harsh conditions on which archaea can thrive.

Archaea are in a different domain from bacteria due to several fundamental differences in their genetic makeup, cellular structure, and biochemical processes. These include differences in their cell membrane composition, the presence of unique RNA polymerases and histones in archaea, variations in metabolic pathways, and their ability to thrive in extreme environments. These distinctions justify placing archaea in a separate domain, distinct from bacteria.