| A | B |
|---|
| Ecosystem | Living and nonliving things in an area |
| Ecology | study of how living things interact in order to survive |
| abiotic factor | the nonliving parts of an ecosystem |
| biotic factor | living parts of an ecosystem |
| population | all the organisms of a species living in the same area |
| community | all the populations living in an area |
| habitat | place where an organism lives |
| niche | the role of an organism in its community |
