| A | B |
|---|
| Carnivore | Consumer that eats only other consumers. |
| Cellular Respiration | Process of breakingdown food to yield energy. |
| Climax Community | Final, stable community that forms when land is left undisturbed. |
| Consumer | Organism that gets its energy by eating other organisms; heterotroph. |
| Decomposer | Consumer that gets its food by breaking down dead organisms, causing them to rot. |
| Food Chain | The sequence in which energy is transferred from one organism to the next as each organism eats and is then eaten by another. |
| Food Web | Diagram shoeing the feeding relationships between organisms in an ecosystem. |
| Herbivore | Consumer that eats only producers. |
| Nitrogen-fixing Bacteria | Bacteria that convert nitrogen gas from the atmosphere into a form that plants can use. |
| Omnivore | Consumer that eats both plants and animals. |
| Pioneers | First organisms to colonize any newly available area and start the process of succession. |
| Precipitation | Rain, sleet, snow, or hail that has condensed from water vapor in the atmosphere and returns to the Earth's surface. |
| Primary Succession | Succession that occurs in areas where no ecosystem has existed previously. |
| Producer | Organism that makes its own food; autotroph. |
| Secondary Succession | Pattern of change in an area where an ecosystem has previously existed. |
| Succession | The regular pattern of changes over time in the types of species in a community. |
| Trophic Level | A step in the transfer of energy through an ecosystem; the level of a food chain that an organism occupies. |
| Water Cycle | The continual process by which water circulates between the atmosphere and the Earth. |
