University of California
Ucmp: The Biosphere: Life on Earth
Learn about different forms of life that coexist with us on Earth. This Berkeley article provides links to brief write-ups on the three domains of living organisms: Eukaryota, Bacteria, and Archaea.
BiologyWise
Biology Wise: Characteristics of Monera
Describes the characteristics of the unicellular prokaryotes in the kingdom Monera and the different phyla within this kingdom. Includes a list of examples.