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University of Cincinnati: Cells and Organelles
An in-depth discussion of the different parts of eukaryotic and prokaryotic cells as well as a thorough explanation of organelles within the cell. The text is better suited to high school and middle school. However, there is a picture of...
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.