| A | B |
|---|
| autotroph | organism which makes its own food |
| heterotroph | organism which must consume other organisms for energy and nutrients |
| biosphere | part of Earth that supports life |
| population | all of a species in an area |
| mutualism | relationship where both organisms benefit |
| commensalism | relationship where one organism benefits and one is unaffected |
| community | all living organisms in an area |
| ecology | study of interactions between organisms and the environment |
| abiotic factors | all non-living parts of an environment, ex. water, light |
| parasitism | organism steals nutrients from its host |
| decomposer | organism that breaksdown dead organisms, ex. bacteria, fungi |
| symbiosis | close, permanent association between different species |
| habitat | place where an organism lives |
| biomass | mass of all living matter |
| ecosystem | all biotic and abiotic factors in an area |
| food web | model that shows all possible feeding relationships in a community |
| food chain | model of how energy flows through an ecosystem |
| niche | how an organisms acquires its food, its lifestyle |
| scavenger | organism which feeds on dead materials |
| biotic factors | all living organisms in an environment |
