| A | B |
|---|
| What are biotic factors? | living things |
| What are abiotic factors? | non-living things |
| Name an important abiotic factor in a marine ecosystem | water depth |
| Most of the nutrients in a tropical rain forest are found in plants so, | the rain forest soil is nutrient poor |
| Where does plankton get food? | photosynthesis |
| What may happen as sediment and decaying organisms build up in a pond? | The pond may become a forest |
| What is the littoral zone of a lake or pond? | an area closest to the edge of a lake or pond |
| Permafrost; in the Arctic or Anarctic | polar tundra |
| many trees that do not change much seasonally | coniferous forest |
| organisms with special adaptations to a hot, dry climate | desert |
| clumps of trees and seasonal rains | savanna |
| found above the tree line of mountains | alpine tundra |
| many trees that change color in the fall | temperate deciduous forest |
| grass, but few trees due to fires, drought, and grazing | temperate grassland |
| made of the skeletons of small animals | coral reef |
| contains huge, floating rafts of algae | Sargasso Sea |
| wetland that is often in the shallow areas along the shores | marsh |
| has icy waters that are rich in nutrients | polar ice |
| has constantly changing amount of salt in the water | estuary |
| wetland that has trees and is often found in low-lying areas | swamp |
