Energy flows through an ecosystem as one animal eats another animal or plant. This is a food chain and shows who eats who in an ecosystem. For example: A hawk -- eats a mouse who...(Read more...)
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National Science Standards for Food Webs

3. Life Science Standards
Science subject matter focuses on the science facts, concepts, principles, theories, and models that are important for all students to know, understand, and use.
K-4 Characteristics of organisms, life cycles of organisms, organisms and environments
5-8 Structure and function in living systems, reproduction and heredity, regulation and behavior, populations and ecosystems, diversity and adaptations of organisms