biome - a geographic area on Earth that contains ecosystems with similar biotic and abiotic features., climate - the average annual temperature and amount of precipitation, desert - an area that receives less than 25 centimeters of rain per year., grassland - an area that is populated mostly by grasses and other nonwoody plants., temperate - regions of Earth between the tropics and the polar circles that have relatively mild climates with distinct seasons., deciduous tree - trees that shed their leaves and grow new ones each year., taiga - a forest biome consisting mostly of cone-bearing evergreen trees. , tundra - biome that is cold, dry, and treeless., rain forest - forests in which large amounts of rain fall year-round., emergent layer - the tallest layer of the rain forest which receives the most sunlight and can reach up to 70 meters, canopy - leafy roof formed by trees up to 50 meters tall in the rain forest, understory - Below the canopy in the rain forest, a layer of shorter trees and vines, around 15 meters high., coniferous trees - trees that produce their seeds in cones and have leaves shaped like needles, permafrost - a permanently frozen layer of soil in the tundra , salinity - the amount of salt dissolved in water., wetland - aquatic ecosystems that have a thin layer of water covering soil that is wet most of the time., estuary - a region along coastlines where the fresh water of a river meets the salt water of an ocean., intertidal zone - located on the shore between the highest high-tide line and the lowest low-tide line., neritic zone - region of shallow water found below the low-tide line and extending over the continental shelf, coral reef - an underwater structure made from outside skeletons of tiny, soft-bodied animals called coral.,

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