| A | B |
| ecology | the study of the interactions of organisms with each other and their environment |
| biosphere | the part of the Earth in which life exists |
| ecosystem | all of the living and non-living parts of an area |
| community | a group of organisms of different species living in a given area |
| succession | the process through which a stable climax community arises |
| biome | a large region of Earth characterized by the climate and organisms within it |
| tundra | biome that is located at the north and south pole |
| taiga | biome characterized by coniferous forests |
| temperate deciduous forest | biome characterized by forests with broad leaf trees |
| grassland | biome with large herding herbivores such as bison and giraffe |
| tropical rain forest | biome that receives the most annual rainfall |
| desert | biome that receives the least annual rainfall |
| producer | an organism that makes its own food through photosynthesis |
| consumer | an organism that gets its nutrients through eating other organism |
| decomposer | an organism that feeds on the remains |
| trophic level | level at which an organism feeds |
| carnivore | an organism that eats meat |
| herbivore | an organism that eats plants and vegetation |
| omnivore | an organism that eats meat and vegetation |