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Ch 3 Science Test Study Guide The Flow of Energy and Matter This test will be given on Name: Be familiar with these facts about living things: Plants are the primary source of matter and energy in most food chains. A human is an omnivore. Fungi are decomposers. A food chain shows the flow of energy from a producer to one or more consumers. A good example of energy flowing from one living thing to the next is carnivores store some of the energy transferred from animals they eat. Draw a picture of each item to illustrate this food chain: grass mouse hawk Sunlight is the main source of energy for most ecosystems on Earth. Most bacteria are helpful. Plants make food by the process of photosynthesis. One benefit of decomposers is they add nutrients to the soil. Be prepared to write complete, detailed sentences to these questions: 1. What is an ecosystem? List one example. 2. Describe three ways that microorganisms are helpful.