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Chapter 18 Test Review (Question, followed by answer) 1. An _____ is any living thing in an environment. Organism 2. A series of overlapping food chains makes up a _____. Food web 3. The size of the population that occupies an area of definite size is its _____. Population Density 4. Where an organism lives in an ecosystem is its _____ habitat 5. The part of Earth that supports life is the _____ biosphere 6. Any close relationship between two or more species is _____ Symbiosis 7. Which of the following is a model that shows the amount of energy available as it flows through an ecosystem? Energy Pyramid 8. Which of the following is a biotic factor? Animals 9. What is made up of all populations in an area? Ecosystem 10. What is the term for the total number of individuals in a population occupying a certain area? Density 11. What is the a tree an example of? Producer 12. Which level of the food chain has the most energy? Producers 13. What is the symbiotic relationship called in which one organism is helped and the other is harmed? Parasitism 14. Which of the following is NOT cycled in the biosphere? Soil 15. What are coral reefs, forest, and ponds examples of? Ecosystems 16. What are all of the individuals of one species that live in the same area at the same time called? Population 17. Why does each level of the energy pyramid smaller than the one below it. The amount of energy available to a consumer decreases at each level with the greatest amount available at the bottom. 18. Compare and contrast the roles of producers, consumers, and decomposers. Producers capture and transfer the sun’s energy into chemical energy. Consumers get energy by eating on producers or other consumers, and Decomposers obtain energy from the remains of organisms. 20. Infer why decomposers are vital to the ecosystem. They break down dead organisms and make the nutrients contained in the organisms bodies available for plants to use.