| A | B |
|---|
| ecological succession | one community of organisms replaces another |
| pioneer community | the first organisms to inhabit an area |
| biome | region with similar climate and climax communities |
| permafrost | permanently frozen soil |
| taiga | northern coniferous forest |
| tropical rain forest | equatorial region that receives large amount of rainfall |
| desert | dry region with poor soil |
| estuary | where fresh water mixes with salt walter |
| intertidal zone | between high and low tide lines |
| plankton | tiny organisms floating in the open ocean |
