Archaea are primitive micro organisms that have one cell and live in environments that are severe, such as those that are extremely salty or hot. They are any of a group of single celled prokaryotic organisms that have distinct molecular characteristics separating them from bacteria and from eukaryotes. read more
Prokaryotes. There are two basic types of organisms based on cell type: Prokaryotic and Eukaryotic. Prokaryotic cells are divided into the domains Bacteria and Archaea. Eukaryotic cells make up the more familiar Domain Eukarya. read more