In this kingdom, all organisms are prokaryotes. In all the other kingdoms, all the organisms wer eukaryotic organisms. All prokaryotae are unicellular. A prokaryote means that their cell do not have a nucleus but there is still DNA but not in any organelle. There are not any membrane bound organelles as well.
This kingdom is divided into the domains, Archea and Bacteria. These organisms also reproduce through binary fission.