| Term | Definition |
| Biome | group of climax communities that have similar climate as well as plant and animal life |
| Estuary | an aquatic biome that is a mixture of fresh and salt water |
| Primary Succession | the building of a community where no previous community existed |
| Secondary Succession | the rebuilding of a community from a natural disaster or human interference |
| Photic zone | the part of an aquatic biome that receives light |
| Aphotic zone | the part of an aquatic biome that does not receive light |
| Coniferous Forest | a forest that is made up of conifer (pine) trees |
| Intertidal zone | the zone on the shore that is covered at high tide but not covered at low tide |
| Biotic factor | any living organism |
| Abiotic factor | a non-living factor of an ecosystem |