| Term | Definition |
| Biology | The scientific study of living organsms and their interactions with the enviroment |
| Biomass | organic matter that can be a source of energy; the total mass of the organisms in a given area |
| biome | A large region characterized by a specific type of climate and certain types of plants and animals communities |
| Biotic factor | An enviromental factor that is associated with or result from the activities of living organisms |
| Bird | Apperantly evolved from feathered dinosaurs during or after the Jurassic period. |