a geographic area on Earth that contains ecosystems with similar biotic and abiotic features

biomes that receive very little rain

biome that are areas where grasses are the dominant plants

regions of Earth between the tropics and the polar circles

a forest biome consisting mostly of cone-bearing evergreen trees

biome that is cold, dry, and treeless

the amount of salt dissolved in water

aquatic ecosystem that has a thin layer of water covering the soil that is wet most of the time

regions along coastlines where streams or rivers flow into a body of salt water

the ocean shore between the lowest low tide and the highest high tide

an underwater structure made from outside skeletons of tiny, soft-bodied animals called coral

the process of one ecological community gradually changing into another

a stable community that no longer goes through major ecological changes

the first species that colonize new or undisturbed land

the process of a body of water becoming nutrient-rich

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