| A | B |
|---|
| Ecology | The study of the interactions among living things and the nonliving things in their environment |
| Community | A group of different populations that live in the same area |
| Habitat | The place where an organism lives |
| Population | A group of organisms of the same species that live in the same area |
| Climax community | A community that changes little over time |
| Ecosystem | The interactions among the populations of a community and the nonliving things in their environment |
| Succession | The process by which a community changes over time |
| Biome | An ecosystem found over a large geographic area |
| Biosphere | The part of earth where living things can exist |
| Resource | A thing that an organism uses to live |
| Consumer | An organism that feeds on other organisms |
| Food chain | The feeding order of organisms in an ecosystem |
| Producer | An organism that makes its own food |
| Carnivore | A consumer that eats only animals |
| Herbivore | A consumer that eats only plants |
| Omnivore | A consumer that eats both plants and animals |
| Food web | All the food chains in an ecosystem that are linked to one another |
| Energy pyramid | A diagram that compares the amounts of energy available to the populations at different levels of a food chain |
