| A | B |
|---|
| ecosystem | all the living and nonliving things in an area |
| population | a group of organisms of one species that live in an area at the same time |
| community | the group of all the populations in an area |
| niche | the job that an organism has in an ecosystem |
| habitat | the place in an ecosystem in which an organism lives |
| energy pyramid | a diagram that shows the amounts of energy available at each level of a food chain |
| cycle | a repeating process or a repeating flow of material through a system |
| biome | a large ecosystem with generally the same climate and organisms |
