Science Struck
Science Struck: Examples of Primary Consumers in the Food Chain
Explains what a primary consumer's role in a food chain is and provides examples.
Science Struck
Science Struck: Rainforest Food Web
Explains the characteristics of tropical and temperate rainforests and what rainforest food webs look like.
Annenberg Foundation
Annenberg Learner: The Habitable Planet: Ecosystems: Energy Flow Through
Detailed explanation of the processes by which energy flows through an ecosystem. Scroll down and open Section 3.