| A | B |
|---|
| ecology | the study of the interaction between organisms and their environments |
| biotic | living parts of the environment |
| abiotic | nonliving parts of the environment |
| organism | one of a species (kind) |
| population | several of a species (kind) |
| community | several species living together |
| ecosystem | a community and its abiotic environment |
| biosphere | the earth, which contains all ecosystems |
