| A | B |
|---|
| decomposers | primarily bacteria that break down the remains of animals. |
| trophic level | steps in the transfer of energy through an ecosystem |
| energy pyramid | shows an ecosystems loss of energy as it passes through the food chain. |
| condensation | the cooling of water vapor as it returns to a liquid state. |
| evaporation | the heating of water by the sun which causes it to turn to a vapor. |
| precipitation | the falling of water to earth as rain,snow,sleet,etc. |
| water cycle | the continuous movement of water between the atmosphere, land and the oceans. |
| carbon cycle | the movement of carbon from the non-living environment to living things. |
| respiration | the process of exchanging oxygen and carbon dioxide between plants and animals. |
| nitrogen cycle | the process by which nitrogen circulates among the air ,water,soil and organisms in an ecosystem. |
