Review Unit 4

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Across
  1. 2. Level - Each step in a food chain or food web.
  2. 4. Chain - A series of organisms each dependent on the next as a source of food.
  3. 6. - The uppermost layer of vegetation in a forest ecosystem.
  4. 7. - A trait that helps an organism survive and reproduce in its environment.
  5. 9. - Introduction of harmful substances into the environment.
  6. 10. - Organism that breaks down dead material and recycles nutrients back into the ecosystem.
  7. 11. Species - Non-native species that disrupts the balance of an ecosystem.
  8. 12. - Increase in concentration of a toxin as it moves up through trophic levels.
  9. 14. - The natural home or environment of an animal, plant, or other organism.
  10. 15. - An organism that makes its own food, typically through photosynthesis.
  11. 16. - An organism that eats other organisms for energy.
  12. 18. - An animal that hunts other animals for food.
Down
  1. 1. - A community of organisms and their physical environment interacting together.
  2. 3. - Process by which plants convert sunlight into food.
  3. 5. - The variety of life in a particular habitat or ecosystem.
  4. 6. - A toxin that can accumulate in reef fish and cause illness if eaten by humans.
  5. 8. - At risk of extinction.
  6. 12. - The build-up of toxic substances in an organism over time.
  7. 13. - Relating to water ecosystems, such as rivers, lakes, or oceans.
  8. 17. - An animal that is hunted and eaten by predators.