Science

4. in ecology, an event that changes a community by removing or destroying organisms or by altering resource availability
8. a triangular diagram that shows an ecosystem's loss of energy, which results as energy passes through the ecosystem's food chain; each row in the pyramid represents a trophic (feeding) level in an ecosystem, and the area of a row represents the energy stored in that trophic level
11. all of the populations of species that live in the same habitat and interact with each other
12. an organism that kills and eats all or part of another organism
14. an organism that gets energy by breaking down the remains of dead organisms or animal wastes and consuming or absorbing the nutrients
15. a relationship in which two different organisms live in close association with each other
18. an environmental factor that is associated with or results from the activities of living organisms
19. a group of organisms of the same species that live in a specific geographical area
21. the replacement of one type of community by another at a single location over a period of time
22. an organism that eats only plants

1. all of the living organisms and their nonliving environment in a specific area
2. the ruin or alteration of a place inhabited by an ecological community
3. a group of organisms that are closely related and can mate to produce fertile offspring
5. the number and variety of organisms in a given area during a specific period of time
6. an organism that eats other organisms or organic matter
7. an organism that is killed and eaten by another organism
9. a diagram that shows the feeding relationships between organisms in an ecosystem
10. ecological relationship in which two or more organisms depend on the same limited resource
13. the process by which plants, algae, and some bacteria use sunlight, carbon dioxide, and water to make food
16. the process by which cells use oxygen to produce energy from food
17. an organism that can make its own food by using energy from its surroundings
20. an environmental factor that is not associated with the activities of living organisms