| A | B |
|---|
| ecology | the study of interactions between organisms and their environment |
| biotic | describes living factors in the environment |
| abiotic | describes nonliving factors in the environment |
| population | a group of individuals of the same species that live together in the same area at the same time |
| community | all of the populations of different species that live and interact in an area |
| ecosystem | a community of organisms and their nonliving environment |
| biosphere | the part of the Earth where life exists |
| organism | a complete, individual living thing |
