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Food Chains and Food Webs Today the students read about and worked through an activity regarding food chains and food webs. They worked with organism cards to create food chains and food webs in a forest ecosystem that includes terrestrial and aquatic environments. The students learned that plants and algae are the primary source of matter and energy entering most food chains and food webs. Producer – An organism, such as a plant or algae, that makes its own food. Consumer – An organism that cannot make its own food. Consumers eat other organisms. Decomposer – An organism that breaks down plant and animal material into simple chemicals. The chemicals can then be reused in the ecosystem. The most important decomposers are bacterial and fungi. Food Chain – A description of the feeding relationships between all of the organisms in an ecosystem, such as grass seeds, chipmunk, and hawk. Arrows point in the direction of the flow of energy from one organism to another. Example: Grass seeds → Chipmunk → Hawk (Scroll down to the next page for more information) Food Web – a description of the feeding relationships between all of the organisms in an ecosystem. Arrows show the flow of energy from one organism to another. Example: The students learned that: Organisms interact in feeding relationships in ecosystems Producers (plants, algae) make their own food, which is also used by animals (consumers). Organisms may compete for resources in an ecosystem. Consumers may eat plants or other animals. Decomposers eat dead plant and animal materials and recycle the nutrients in the system.