| A | B |
| biosphere | our entire planet, with all its organisms and physical environments |
| biome | a group of ecosystems that share similar climates and typical organisms |
| climate | the weather conditions prevailing in an area in general or over a long period |
| climograph | A climograph is a graphical representation of a location's basic climate. |
| Ecology | scientific study of interactions among organisms and between organisms and their environment |
| Tundra | a vast, flat, treeless Arctic region of Europe, Asia, and North America in which the subsoil is permanently frozen. |
| aquatic | the habitats around the world that are dominated by water |
| Grasslands | a large open area of country covered with grass, especially one used for grazing |
| Forest | made up of trees and other woody plants. |
| Deserts | extremely dry environments that are home to well-adapted plants and animals. |