| A | B |
| biosphere | All areas of the Earth in which living things can be found |
| biotic factors | the living things in the environment |
| environment | your surroundings |
| abiotic factors | non-living things in the environment |
| ecology | the study of the interrelationships of living things and their surroundings |
| ecosystem | populations in a community and the abiotic factors with which they interact |
| niche | the particular role of an organism within a communtiy |
| population | interbreeding individuals within a living system |
| community | several interacting populations that inhabit a common environment |
| food chain | a possible route for the transfer of matter and energy through an ecosystem |