| A | B |
|---|
| ecosystem | limited area in which living and nonliving things interact |
| ecology | the study of organisms |
| physical environment | nonliving part of the ecosystem |
| biotic community | living organisms in an ecosystem |
| habitat | the area within an ecosystem where an organism lives |
| population | all the members of one kind of species in an ecosystem |
| rhythms | changes in an ecosystem that happen on a regular basis |
| nocturnal | species that are active at night |
| diurnal | species that are active during the day |
| hibernation | dormant state in winter |
