| A | B |
|---|
| Adaptation | a particular development, behavior, or physiological characteristic of an organism that increases its chance of survival in its environment |
| Biodiversity | the existence of a wide range of different species in a given area or specific period of time |
| Biome | a complex biotic community characterized by the interaction of living organisms and climatic factors |
| Community | all the populations of organisms belonging to different species and sharing the same geographical area |
| Conservation | controlled use and/or maintenance of natural resources; various efforts to preserve or protect natural resources |
| Ecosystem | an integrated unit of a biological community, its physical environment, and interactions |
| Environment | the sum of conditions affecting an organism, including all living and nonliving things in an area, such as plants, animals, water, soil, weather, landforms, and air |
| Habitat | a place in an ecosystem where an organism normally lives |
| Natural Selection | the theory stating every organism displays slight variations from other organisms of its kind, and the struggle for limited natural resources results in individuals with certain natural variations adapted to their specific environments |
| Niche | the unique position occupied by a particular species in terms of the area it inhabits and the function it performs within the community |
| Population | a group of organisms of the same species living in a specific geographical area |
| Succession | the progressive replacement, on a single site, of one type of community by another |
