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| A large characterized by a specific type of climate and certain types of plant and animal communities |
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| A region of forest or jungle that located near the equator and that is characterized by large amounts of rain and a little variation in temperature |
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| A region that has little or no vegetation, long periods without rain, and exetreme temperatures; usualy found in a warm climate |
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| A plain full of grasses and scattered trees and shrubs; found in trobical and subtropical habitats and mainly in regions with a dry climate, such as East Africa |
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temperate Deciduous forest |
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| A region of forest that has pronouced seasons, moderate temperatures, and moderate precipitation; chracterized by trees that shed their leaves in the fall |
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| A region that ha cold winters and rainfall that is intermediate between that of a forest and a desert; characterized by extensive grasses and few trees |
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| A region of evergreen, coniferous forest below the artic and subartic tundra regions |
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| A treeless plain that is located in the arctic or antartic and that is characterized by very low winter temperatures; short, cool summers; and vegetation that consists of grasses, lichens, and perennial herbs |
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| In artic regions, the permanetly frozen layer of soil or subsoil |
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| the prevailing influence or environmental conditions characterizing a group or period |
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| The mass of mostly microscopic organisms that float or drift freely in the waters of aquatic environments |
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| a wetland often partially or intermittently covered with water; especially : one dominated by woody vegetation |
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| A limestone ridge found in tropical climates and composed of coral fragments that are deposited around organic remains |
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| An area where fresh water from rivers mixes with salt water from the ocean; the part of a river where the tides meet the current |
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flat land subject to overflow by salt water
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| The area of an aquatic system that recieves enough light for photosynthesis to occur |
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| The deeper parts of the ocean, where there is so little light that plants cannot carry out photosynthesis |
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