| A | B |
|---|
| Photosynthesis | Plants use the sun for energy. |
| Producer | makes its own food. |
| Consumer | Gets energy by eating other organisms |
| Decomposer | Breaks down dead organimsm in an ecosystem an returns nutrients to the soil,water, and air. |
| Cellular Respiration | Breaking down food to yeild energy. |
| Food Chain | Sequence in which energy is trasnferred from one organism to the next. |
| Food web | Shows feeding relationships that are possible in an ecosystem. |
| Trophic level | One of the steps in a food chain or food pyramid |
| Carbon cycle | Process by which carbon is cycled between the atmosphere,land,water,and organisms. |
| Nitrogen-fixing bacteria | Can fix atmospheric nitroger into chemical compound. |
| Nitrogen cycle | Process in which nitrogen is cycled between the atmosphere, bacteria, and other organisms. |
| Phosphorous cycle | the movement of phosphorous from the environment to organisms and then back to the environment. |
| Ecological succession | Gradual process of change and replacement of some or all of the species in a community. |
| Primary succession | Type of succession that occurs on a surface where no ecysystem existed before. |
| Secondary succession | occurs on a surface where an ecosystem has previously existed. |
| Pioneer Species | First plant to grow in a new area. |
| Climax Community | Final and stable community. |
