| A | B |
|---|
| Biosphere | portion of Earth where all living things exist |
| Population | all of the individuals of a single species that live in a specific area (simplest grouping of organisms) |
| Habitat | an area where an organism lives |
| Community | a group of interacting populations that occupy the same geographic area |
| Ecosystem | communities and the physical enviroment with interactions between living and non-living components |
| Niche | interactions and roles an organism plays |
| Abiotic factors | non-living factors in an organisms enviroment |
| Biotic factors | all organisms and their effect on other living things |
| Biodiversity | variety of life and the number of different species within a given region |
| Producer | make own food (autotroph) |
| Consumer | must find food (heterotroph) |
| Decomposer | break down dead plants and animals (organisms of decay) |
| Parasitism | one organism benefits while the other is being harmed (parasite feeds on a living host) |
| Succession | ecosystems undergo change |
