University of California
Ucmp: Introduction to Bacteria
This site provides an introduction to bacteria and examines fossil records, life history and ecology, systematics, and morphology.
Estrella Mountain Community College
Estrella Mountain Community College: The Diversity of Life
Detailed information about each of the five kingdoms. Each kingdom is separately described, but information is also summarized in a table.
Other
The Domains and Kingdoms of Life
This site is a description of the history behind the 5 Kingdom system suggested by Robert Whittaker. An extensive list of resources is included.
Middle School Science
Middle School Science: Where Can We Find Bacteria?
In this experimental site, you will find out where bacteria hang out and determine what kind of environmental conditions influence bacterial growth. Directions are clear and complete.