Ecology

4. An animal that naturally preys on others.
7. A species not native to a specific location and tends to spread and cause harm to the environment.
9. The soil horizon below horizon A. Contains clay and minerals.
11. Rock so deep that it has not been broken down into soil.
13. The 2nd level on an energy pyramid. They eat the producers.
14. The third level on an energy pyramid behind the primary consumers.
18. The organism that is causing harm to the host during parasitism.
20. A relationship where once organism is benefited. The other is not affected.

1. A relationship where both species are benefited.
2. The lowest level in an energy pyramid.
3. Environmental conditions that limit the growth of organisms.
5. The soil horizon closest to the ground. Contains clay, humus, and minerals.
6. A relationship where one organism lives on another causing it harm.
8. A relationship between two organisms.
10. The highest level on an energy pyramid behind the secondary consumers.
12. A species that if taken out of a food chain, the food chain would collapse.
15. The soil horizon below the B horizon. Contains partly broken down rock.
16. The rule where only 10% of energy is passed onto another trophic level.
17. An animal that is hunted and killed for food.
19. The organism that is harmed during parasitism.