Bozeman Science
Bozeman Science: Three Domains of Life
Paul Andersen starts with a brief description of the history of life. He then discusses the seven characteristics of life and why viruses are not alive. He then describes the three domains in the current classification system and...
Exploratorium
Exploratorium: Cellular Structure and Function
Through the use of photos and videos, the different types of cell structure and function are examined in this colorful and informative site.