| A | B |
| limiting factors | any biotic or abiotic factors that restricts the existence of organisms |
| organism | an individual living thing that is made of cells, uses energy, reproduces, responds, grows, and develops |
| biome | a community of plants and animals that have common characteristics for the environment they live in |
| biosphere | the portion of the Earth that supports life |
| niche | an organism's way of life (role in its environment) |
| ecology | the study of interactions that take place between organisms and their environment |
| ecosystem | populations of plants and animals that interact with each other in a given area with the abiotic components of that area |
| community | all the populations of different species that live at the same place at the same time |