| A | B |
|---|
| ecosystem | all of the living and nonliving things that interact together in a given area |
| community | group of living things of different species found in an ecosystem |
| population | all the members of the same type of organism living in an ecosystem |
| biome | large group of similar ecosystems |
| climate | type of weather that occurs in an area over a long period of time |
| desert | very dry area that receives little rainfall |
| grasslands | land covered by grasses with few trees |
| taiga | area that has long, severe winters and short, cool summers |
| temperate forests | forests that experience four distinct seasons |
| tropical rain forests | forests that are both very hot and very rainy |
| tundra | Earth's coldest biome |
| food chain | description of how energy in an ecosystem flows from one organism to another |
| food web | description of all the food chains |
| energy pyramid | model of how energy moves through an ecosystem |
| symbiosis | a relationship of mutual benefit or dependence |
| commensalism | a relationship between two species where one species derives benefit from the other, but the other is unaffected |
| parasitism | a relationship in which one species benefits (is helped) and the other is harmed |
| mutualism | a relationship in which both species benefit (are helped) |
