| A | B |
|---|
| Ecology | Scientific study of interactions among orgainsms and their environment. |
| biosphere | Portion of the Earth that supports life. |
| abiotic factor | Nonliving parts of an organism's environment. |
| biotic factor | Living parts of an organism's environment. |
| population | A group of animals of one species that interbreed and live in the same area. |
| community | A collection of interacting populations. |
| ecosystem | The interactions among populations in a community and the abiotic factors around them. |
| habitat | A place where an organism lives. |
| niche | The role of an organism has in its environment. |
| symbiosis | Two organisms living in close association. |
| commensalism | Close relationship in which one organism benefits and the other organism is neither harmed nor helped. |
| mutualism | Close relationship from which both organisms benefit. |
| parasitism | Symbiotic relationship where one organism benefits and the other is hurt. |
