Archaea topic

The Archaea are a group of prokaryotic and single-celled microorganism. In this they are similar to bacteria but these two groups evolved differently, and are classified as different domain in the three-domain system. Originally these organisms were named archaebacteria. However, this term has not been favored since the three-domain system became popular. Although there is still uncertainty in the phylogeny, Archaea, Eukaryota and Bacteria were introduced as the fundamental classifications... full article at wikipedia