| A | B |
|---|
| photosynthesis | The process by which plants, algae,and some bacteria use sunlight, carbon dioxide, and water to produce carbohydrates and oxygen. |
| Producer | an organism that makes its own food. |
| Consumer | an organisms that get thier energy by eating other organisms. |
| Decomposers | Organisms that thier food by breaking down dead organisms. |
| Cellular Respiration | The process of breaking down food to yield energy. |
| Food Chain | A sequence in which energy is transferred one organism to the next as each organism eats another organism. |
| Food Web | A diagram that shows many feeding relationships that are possible in an ecosystem. |
| Trophic Level | One of the steps in a food chain or food pyramid. |
| Carbon Cycle | A process by which carbon is cycled between the atmosphere, land, water, and organisms. |
| Nitrogen -Fixing Bacteria | Bacteria that convert atmospheric nitrogen into ammonia. |
| Nitrogen Cycle | A process in which nitrogen is cycled between the atmosphere, bacteria, and other organisms. |
| Phosphorus Cycle | The movement of phosphorus from the environment to organisms and then back to the environment. |
| Ecological succession | A gradual process of change and replaemnt of some or all of the species in a community. |
| Primary Succession | The type of succession that occurs on a surface where o ecosystem existed before, such as on rocks or sand dunes. |
| Secondary Succession | The process by which one community replaces another community that has been partially or totally destroyed. |
| Pioneer species | The first organisms to colonize a newly available area and begin the process of ecologicial succession. |
| Climax Community | The final and stable community in equilibrium with the environment. |
