McGraw Hill
Glencoe Biology: Principles of Ecology: Chapter Test Practice
A set of fifteen comprehension questions which test over various ecological concepts.
Yale University
Open Yale Courses: Principles of Evolution, Ecology, and Behavior
Access any one of thirty-six lectures from a biological sciences course, in audio, video, and text format. Coverage includes evolution, natural selection, the fossil record, the history of life on Earth, ecological communities,...
CK-12 Foundation
Ck 12: Episd: Ecosystems
[Free Registration/Login may be required to access all resource tools.] Explore ecosystems and ecology on an introductory level uncovering fact about types of ecosystems and the competitive exclusion principle.