Ecology Part 1

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Across
  1. 4. environment that is home to an organism
  2. 8. Restricts growth of population
  3. 11. the mass of living biological organisms
  4. 12. system of interaction of environment and organisms
  5. 15. organisms that make their own food
  6. 19. breaks down dead organic material
  7. 20. nonnative organisms spreading in environment
Down
  1. 1. living things in an ecosystem
  2. 2. biological variation of a species
  3. 3. nutrients and energy is passed between organisms
  4. 5. non-living things in an ecosystem
  5. 6. inborn impulse
  6. 7. 10% of energy given to levels above it
  7. 9. organism that doesn't make its own food
  8. 10. organism helps define entire ecosystem
  9. 13. organism kills and eats another organism
  10. 14. animal that is hunted or killed for food
  11. 16. rivalry over resources between organisms
  12. 17. all food chains of an ecosystem
  13. 18. variety of life in an ecosystem