JazSinc
It has to do with ether-linked lipids where Bacteria have ester-linked.
Ted K
Technically, Archaea are distinguished from bacteria based on differences in variable sequence regions of their 16s ribosomal DNA. Beyond that, it's not easy to tell them apart, other than archaea tend to be more often than not, "extremophiles," thriving in places that most bacteria can't handle, e.g. the bottom of the ocean slowly eating the iron in sunken ships like theTitannic, highly acidic or salty environments, e.g. Yellowstone hotsprings, deep sea alkaline thermal vents, etc.
Cowboy
The differences are as profound as between Eukarya and Bacteria - a different type of cell
?
Archaea constitute a domain of single-celled organisms. These microorganisms lack cell nuclei and are therefore prokaryotes. Archaea were initially classified as bacteria, receiving the name archaebacteria, but this classification is obsolete.
Anonymous
Archaea is old bacteria ?