| A | B |
| Ecosystem | The community and the physical environment |
| Niche | The role of a population in its habitat |
| Decomposer | Breaks down tissues of dead organisms |
| Producers | Use sunlight to make their own food |
| Individual | A single organism in the environment |
| Habitat | A place whre a population lives in an ecosystem |
| Population | Individuals of the same kind living in the same environment |
| Food Chain | Show what different consumers eat |
| Consumer | Organisms that eat to get the energy they need |
| Community | All the populations of organisms living together |