Site provides a realistic animation of an earthworm digesting its food. [1:00]
Excellent, comprehensive site on multiple regression. Key terms are defined and explained as needed. Links to relevant topics are provided.
Includes a description of symbiosis in general, then lists and defines types of symbiosis including mutualism, commensalism, parasitism, competition, and neutralism. Includes a chart which summarizes the different types of relationships. Also lists several examples of insect symbiosis with some links to more in-depth descriptions.