the areas of air, land and water where life exists on earth
a region of the biosphere that has a specific climate and certain types of plants and animals
the nonliving characteristics of a biome
the temperature and amount of precipitation determine this
the permanently frozen soil in the tundra that begins about 12 inches below the surface
a type of plant that produces seeds inside cones. these plants are well adapted for living in the taiga
plants that lose their leaves during the winter
the various layers of plants found in a forest
the tallest layer of trees in a forest. these are the mature trees that receive the most sunlight
the immature trees in a forest. they grow slowly because they receive less sunlight
the bushes and shrubs in a forest. their density determines if the forest is called a "jungle"
the grasses, ferns and moss that grows on the floor of the forest
the dead material on the floor of the forest. it replenishes the nutrients in the soil as it decomposes
the trees in a forest that tower above the canopy
plants that grow on other plants
the widening of a tree's trunk that serves to stabilize the tree and keep it upright. this occurs when a tree's roots do not extend down deep enough to stabilize the tree
plants that store water in their stems and leaves
a long period of inactivity inside a seed. when the conditions improve the seed will come out of dormancy and sprout
when an animal is only active at night. this protects the animal from dehydrating during the day.
a waterproof chemical that covers the surface of the skin. it protects an animal from dehyrdating
the gradual change of a biome into a desert. this is often a result off human activities
the region on a mountain above which trees will not grow. this region resembles a tundra
a region where deep, nutrient rich water is brought to the surface by offshore winds
this region along the shoreline is under water during high tide and out of the water during low tide. this zone is commonly called beach
this region extends from the littoral zone to the edge of the continental shelf
the free swimming animals in the sublittoral zone
the animals that live on the bottom of the sublittoral zone
the region beyond the continental shelf
the upper region of the pelagic zone through which light penetrates
the middle region of the pelagic zone where no light penetrates
the lowest region of the pelagic zone characterized by very cold temperature and high pressure
aquatic, single celled photosynthetic organisms that forms the basis of the food chain
aquatic, single celled organisms that can not perform photosynthesis. they are heterotrophic
a measure of how unclear water is. this prevents light from penetrating
the region where a river empties into the ocean
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