| Term | Definition |
|---|
| Biosphere | part of the earth that supports life, including the top portion of Earth's crust, the atmosphere and all the water on Earth's surface. |
| Ecosystem | all the living organisms that live in an area and the nonoliving features of their enviroment. |
| Rainforest | a tropical forest, usually of tall, densely growing, broad-leaved evergreen trees in an area of high annual rainfall. |
| Desert | a region so arid because of little rainfall that it supports only sparse and widely spaced vegetation or no vegetation at all. |
| Tundra | one of the vast, nearly level, treeless plains of the arctic regions of Europe, Asia, and North America., a biome that has very cold temperatures and little rainfall |
| Forest | an area with a high density of trees., the trees and other plants in a large densely wooded area |
| Temperate | (of weather or climate) free from extremes; not too hot, not too cold; mild. |
| Savannah | flat grassland, few trees in tropical areas |
| Wetlands | land that has a wet and spongy soil, as a marsh, swamp, or bog; an area between land and water where the water table is generally at or near the surface or the land is covered with shallow water |
| Tropical | of weather or climate; hot and humid as in the tropics |
| Rainforest | hot, wet biome where trees grow very tall and keep their leaves all year long. More plants here than anywher else in the world. Tropical plants.; very high annual rainfall |
| Marine | covers 70% of earth's surface; largest biome; temperatures vary from region to region;, of or relating to the sea |
| Arctic | the regions north of the Arctic Circle centered on the North Pole |
| Habitat | place where an organism lives and that provides the types of food, shelter, moisture, and temperature needed for survival |
| Niche | the unique ways an organism survives, obtains food and shelter, and avoids danger |
| Tropical rainforest | a woodland of tall trees growing in a region of year-round warmth and abundant rainfall |
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