| A | B |
|---|
| Ecology is | the scientific study of interactins among organisms and between organisms and their environment. |
| Trophic levels are | the levels of organization in an ecosystem. |
| Trophic levels are also | steps in the food chain or food web. |
| The sun is | the original source of all energy . |
| All of the food chains in an ecosystem | make up a food web. |
| Producers are the | level of trophic levels that holds the most energy. |
| Only about 10% of the energy available within one trophic level | is transferred to organisms at the next trophic level. |
| Biological magnification is | when concentrations of harmful substances increase in organisms at higher trophic levels in food chains or webs. |
