| A | B |
| ecology | the study of interactions that take place between organisms and their environments |
| habitat | the place a plant or animal lives |
| niche | an organism's total way of life |
| abiotic factors | the non-living parts of an organism's environment |
| biotic factors | all the living organisms that inhabit an environment |
| organism | an individual living thing |
| population | a group of organisms, all lof the same species, which interbreed and live in the same place at the same time |
| community | all the population of different species that live in the same place at the same time |
| ecosystem | populations of plants and the animals that interact with each other in a given area with the abiotic components of that area |
| biome | a group of ecosystems that have the same climate and similar communities |
| biosphere | the portion of earth that supports life |
| symbiosis | the act of living together |
| mutualism | symbiotic relationship where both organisms benefit |
| commensalism | symbiotic relationship where one organism benefits and one organism is unaffected |
| parasitism | symbiotic relationship where one organism benefits and the other organism is harmed |