Across
- 2. an interaction between two organisms in which one of them benefits but the other one is not affected
- 6. a method of controlling unwanted pests by using a natural predator or disease
- 9. a system formed by organisms interacting with each other and with their non-living surroundings in a balanced way
- 11. an organism in or on which a parasite lives
- 15. an organism that lives on or in a host, taking food or shelter from the host; the host gets nothing in return and may be harmed
- 18. times of the year when fires are most likely to occur
- 20. an interaction between organisms in which both the organisms benefit from the relationship and neither is harmed
Down
- 1. living factors in the environment
- 3. factors non-living factors in the environment
- 4. scientists who study the interactions between living things and their environment
- 5. the place where all life exists; consists of Earth and its atmosphere
- 7. organisms that have the same food source and live in the same habitat
- 8. organisms that must eat other organisms to get the energy and nutrients they need; animals are consumer organisms
- 10. active or hunting at night
- 12. depending on each other for survival
- 13. all living things
- 14. the place where an organism lives
- 16. area along the banks of rivers and streams that is flooded when water levels are high
- 17. the term used to describe all the conditions that affect a plant or animal in its habitat
- 19. characteristics that help an organism to survive in its environment