Ecology

4. Interaction where one organism kills another for food
6. A type of succession in a place where an ecosystem already exists
9. All the members of one species in an area
11. The study of how organisms interact with each other
12. Living factors in an environment
14. Shows the amount of energy that moves from one feeding level to another
15. The struggle between organisms to survive
16. Many overlapping food chains
19. An environment that provides the things a specific organism needs to live, grow, and reproduce
21. The community of organisms that live in a particular area, along with the nonliving environment
22. An organism that breaks down biotic waste
25. The ability of an ecosystem to maintain biodiversity

1. One species benefits, the other is harmed
2. The number and variety of species in an area
3. All of the populations in an area
5. A series of events in which one organism eats another and obtains energy
7. An organisms that makes its own food
8. An organisms that obtains energy by feeding on other
10. The process of turning nitrogen from the air into usable, consumable, nitrogen
13. One species benefits, the other is not affected
17. A type of succession where life is introduced to a new area
18. A series of predictable changes over time
20. Both species benefit
23. Non-living factors in an environment
24. Any relationship in which two species live closely together