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  1. 4. the contamination of air, water, or soil by substances that are harmful to living organisms
  2. 7. the place where an organism lives that provides all of its needs
  3. 12. a consumer that feeds on plants and animals
  4. 13. a consumer that feeds on plants only
  5. 15. a nonliving part of an ecosystem
  6. 16. the result of cutting down or clearing all the trees in an area
  7. 17. all of the different populations that live together in an area
  8. 19. an organism that can make its own food through photosynthesis (or chemosynthesis)
  9. 20. a severe lack of rainfall in an area over a certain time period
  10. 21. a distinct group of animals or plants that have common characteristics and can breed successfully with each other
  11. 22. synonym for producer- an organism that is able to produce its own food through photosynthesis or chemosynthesis
  12. 23. an organism that breaks down waste and dead organisms
  1. 1. organisms that are better suited for their environment are more likely to survive and reproduce (theory associated with Charles Darwin)
  2. 2. changes that occur in an area where no ecosystem previously existed
  3. 3. ecological _______ measures the variety of all living organisms in an ecosystem
  4. 5. an organism that lives in or on another organism and cause harm to it
  5. 6. all the members of one species in a particular are
  6. 8. a characteristic that helps an organism survive in its environment and reproduce
  7. 9. an organism that gains energy by feeding on other organisms
  8. 10. an organism that a parasite lives in or on
  9. 11. an organism that hunts other organisms (consumers) for food
  10. 14. the process of grouping something according to its qualities or characteristics
  11. 18. fish and shellfish populations dropping quickly because they are being removed from oceans faster than they are able to reproduce