| A | B |
|---|
| energy pyramid | a diagram that compares the amount of energy available at each level of the feeding order in a community |
| ecosystem | an area for study of how organisms and nonliving materials act together |
| water cycle | circular pathway in which water moves through the environment |
| carbon dioxide-oxygen cycle | circular pathway in which carbon dioxide and oxygen cycle through the environment |
| nitrogen cycle | circular pathway in which nitrogen moves through the environment |
| biome | a large geographic region in many locations with similar kinds of communities and climates |
| latitude | distance north or south of the Equator |
| tundra | the northernmost and coldest land biome |
| permafrost | ground that is permanently frozen |
| taiga | biome just south of the tundra, characterized by conifers |
| temperate deciduous forest | biome characterized by trees that lose their leaves each year |
| tropical rain forest | biome that has much rainfall and high temperatures all year |
| grassland | biome characterized by few trees and many grasses |
| desert | biome with high daytime temperatures and little rainfall |
| saltwater biome | water biome that has a high salt content |
| freshwater biome | biome that has a low salt content |
