| A | B |
|---|
| Biotic | A living part of the ecosystem. |
| Abiotic | A nonliving part of the ecosystem. |
| Ecosystem | All the living and nonliving things that interact in an area. |
| Biome | A group of ecosystems with similar climates and organisms. |
| Niche | An organism's particular role in an ecosystem, or how it makes its living. |
| Habitat | The place where an organism lives and that provides the things the organism needs. |
| Population | The number of individuals of one species in an area. |
| Species | A group of similar organisms whoe members can mate with one another and produce fertile offspring. |
| Interaction | The action or influence between two things. |
| Biodiversity | The number of different species in an area. |
| Sustainability | The ability to be maintained--to keep going. |
| Adaptation | A variation in structure, form or habit that enables survival under certain conditions. |
| Limiting Factors | A condition in an ecosystem that restricts (prevents) a species from reproducing to its potential. |
| Equilibrium | A state in which opposing forces in a system are equally balanced or stable. |
| Vegetation | Plant life. |
| Genetic Variation | Differences within a species. |
