Across
- 4. relationship where one organism benefits the other organism is neither helped nor harmed
- 5. the elimination or alteration of the conditions necessary for animals and plants to survive
- 6. death of many species in a relatively short time known as
- 7. A species that plays a critical role in the health, maintenance, growth, or definition of an ecosystem.
- 9. the illegal hunting (poaching) also known as
- 14. the level of biodiversity that involves a variety of habitats and communities is
- 15. the deepwater horizon oil spill/gulf of mexico cause a decrease in fish population and is an example of
- 16. number and variety of species on earth is called
- 18. If farmers use a controlled burn to prevent forest fires, what would most likely be the first plants to return?
- 19. honeycreeper found only in the Hawaiian islands area an example of
- 20. help animals to survive and reproduce
- 21. What is formed during primary succession that doesn't need to be formed during secondary succession?
- 22. one organism benefits but the other is harmed
Down
- 1. One whose numbers are so small that it is at risk of extinction
- 2. species with a declining population that could become endangered
- 3. the end stage of succession
- 8. A non-native (not naturally found) species added to an area.
- 10. an organism that is not native to a particular region
- 11. when a species of animals are no longer living
- 12. pioneer species of primary succession
- 13. After a forest fire, an ecosystem would start regrowth through
- 17. a relationship where both organisms benefit