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