| Term | Definition |
| population | group of the same kind of orgamisns living in a certain place |
| community | all the pulations that live in a cetain place and can interact with one another |
| ecosystem | group of communities interacting with each other and the nonliving parts of thier environment |
| producer | organism that makes its own food |
| consumer | organism that obtain food by eating other organisms |
| herbivore | consumer that only eats plants |
| carnivore | consumer that only eats animals |
| omnivore | cosumers that eat both plants and animals |
| scavenger | animals that only eat dead organism (left overs) |
| decomposer | organism that breaks down the wastes or remains of other orgamism |