Massachusetts Institute of Technology
Mit: Open Course Ware: Ecology: Communities and Ecosystems
This is a collection of courses on communities and ecosystems. Some topics explored are productivity, food webs, and ecology. The courses offer video clips, lecture notes, practice problems, and exam questions. Practice problems and exam...
CK-12 Foundation
Ck 12: Biology: Ecosystems
[Free Registration/Login may be required to access all resource tools.] Introduction to ecosystems and other ecological concepts.
CK-12 Foundation
Ck 12: Earth Science: Agriculture and Human Population Growth Study Guide
[Free Registration/Login may be required to access all resource tools.] Summarizes the key points about the evolution of agriculture and how it has impacted human population growth. Includes a few questions to check for understanding.