Chapter 20: Organisms and Their Environment

3. All the populations of different species living and interacting with one another in a habitat.
5. A network of interconnected food chains.
7. community Different populations of plants and animals live together and interact within the same environment.
9. Organisms that get their energy by breaking down dead organisms, faces and excretory products.
12. The place where an organism lives.
13. Organisms that makes their own organic food substances.
14. Organisms that obtain energy and nutrients by feeding directly on plants.
15. Organisms obtain energy and nutrients by feeding on other animals.
16. A nutrient cycling consists of processes by which nitrogen is constantly removed from the soil and is eventually returned to it in the form of nitrates.
18. A group of organisms of the same species that live together in a habitat.
20. A diagram which allows us to compare the total energy in each trophic level of a food chain over a certain period of time.
21. Animals that feed on other animals.

1. The position of an organism in a food chain, food web or ecological pyramid.
2. A series of organisms through which energy and nutrients are transferred, beginning with a producer.
4. A diagram which the producers are placed at the bottom, the primary and secondary consumers in the middle, and the tertiary consumers at the top.
6. A community of organisms interacting with one another and with its non-living environment.
8. Organisms that are not able to make their own food, they obtain energy and nutrients by feeding on other organisms.
10. A diagram which allows us to compare the mass of organisms present in each trophic level at a particular time.
11. A nutrient cycling made up by the various process by which carbon, in the form of carbon dioxide, is removed from and released into the environment.
17. The study of continuously interactions between organisms, and their surroundings (environment).
19. Animals that are eaten by other animals