| Term | Definition |
| Habitat | The place in which an organism lives. |
| Nutrients | Substances that are reuired by plants and animals for energy, growth, development, repair, or maintenance. |
| Photosynthesis | A chemical reaction that converts solar energy into chemical energy usable by plants. |
| Population | All members of a particular species within an ecosystem. |
| Community | All the populations of the different species that interact in a specific area or ecosystem. |
| Ecological Hierarchy | The order of biotic interactions and relationships in an ecosystem. |
| Ecosystem | IT has abiotic components that interact with biotic components. |