chapter 5 crossword

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Across
  1. 4. A method of controlling unwanted pests by using a natural predator or disease.
  2. 5. Species that is experiencing a rapid population decline and is in danger of becoming extinct if the drop in numbers continues.
  3. 6. An ecosystem that is diverse and able to provide for the needs of the organisms living there over a long period of time
  4. 8. Regular burning to reduce the amount of fuel available for a fire
  5. 9. An interaction in which one type of organism (the parasite)lives on or in another type of organism (the host);the host is usually harmed or even killed.
  6. 11. The place where an organism lives.
  7. 13. Area along the banks of rivers and streams that is flooded when water levels are high.
  8. 15. The process of mating one breed of plant or animal with another breed of that plant or animal (e.g. cattle).
  9. 16. The flow of energy from organism to organism in a series of feeding relationships
  10. 18. A number of food chains combined
  11. 20. Organisms that get the energy they need by breaking down dead matter and waste products.
  12. 21. Species that are close to extinction and very small numbers remain.
Down
  1. 1. An interaction between two organisms in which one of them benefits but the other one is not
  2. 2. An organism able to manufacture its own food; plants are producer organisms
  3. 3. get the energy and nutrients they need; animals are consumer organisms.
  4. 7. native vegetation that remains unchanged when surrounding areas have been changed by activities such as grazing or forestry.
  5. 10. An interaction between organisms in which both the organisms benefit from the relationship and neither is harmed.
  6. 12. Species that has low numbers, often spread out over a large area; the population is not decreasing.
  7. 14. Characteristics that help an organism to survive in its environment.
  8. 17. Organisms that must eat other organisms
  9. 19. Raised bank built to prevent water reaching buildings.