US Department of Agriculture
Food and Nutrition Topics a to Z
More than just food and nutrition links can be found in this index of health topics. The USDA's Food and Nutrition Information Center provides access to a world of health information.
CK-12 Foundation
Ck 12: Plix: Ecosystems: Food Chain Pyramid
[Free Registration/Login Required] In this interactive you will need to design a food chain that corresponds with the correct ecosystem. You will need a sign-in to access the media but it will be well worth your time!
Georgia Department of Education
Ga Virtual Learning: Biology: Ecology I
A comprehensive ecology learning module where students assess the dependence of all organisms on one another and the flow of energy and matter within their ecosystems.