| A | B |
|---|
| ecology | the study of the interactions among living things and the nonliving things in their environment |
| Energy pyramid | a diagram that compares the amounts energy available to the populations at different levels of a food chain |
| community | a group of different populations that live in the same area |
| habitat | the place were an organism lives |
| population | a group of organisms of the same species that live in the same area |
| climax community | a community that changes little over time |
| ecosystem | the interactions among the populations of a community and the nonliving things in their environment |
| succession | The process by which a community changes over time |
| acid rain | rain that is caused by pollution and is harmful to organisms because it is acidic |
| biome | an ecosystem found over a large geographic area |
| pollution | anything added to the environment that is harmful to living things |
