| A | B |
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| ecology | the study of the interactions among living things and the nonliving things in their environment |
| Energy pyramid | a diagram that compares the amounts energy available to the populations at different levels of a food chain |
| community | a group of different populations that live in the same area |
| habitat | the place were 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 |
| acid rain | rain that is caused by pollution and is harmful to organisms because it is acidic |
| biome | an ecosystem found over a large geographic area |
| pollution | anything added to the environment that is harmful to living things |
| biosphere | the part of the 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 |
| interact | to act upon or influence something |
| food web | all the food chains in an ecosystem that are linked to one another |
| pyramid of numbers | a diagram that compares the sizes of population at different levels of a food chain |
