| A | B |
|---|
| Habitat | Place where an organism lives and gets its resources |
| Niche | Role an organism plays in the ecosystem |
| Competition | when two or more populations use the same resaources |
| Carrying Capacity | Largest number of a species an ecosystem can support |
| Limiting Factor | anything that restricts the size of a population |
| Biosphere | part of the earth that can support life |
| Biotic | living factors in an ecosystem |
| Abiotic | nonliving factors such as temperature and moisture |
| Resources | factors needed by an organism to survive |
| Adaptation | traits that help an organism to survive |
| Biodiversity | the variety of organisms in an environment |
| Extinct | no more living members of a species |
| Fossil | remains or evidence of ancient organisms |
| Natural Selection | change of traits in response to environmental changes |
| Trait | physical structure or behavior |
| Mutation | random change in a gene |
| Gene | segment of DNA that controls traits |
| Ecosystem | living and non living factors in an environment |
| Population | all of one species in an ecosystem |
| Community | all the populations in an ecosystem |
