The life zones are areas within the northern cascade that are effected by climate, soil development, elevation, and other physical factors to provide each area with a unique, continually evolving plant and animal communities. The Northern Cascades National Park has five of these distinct zones, the Humid Transition Zone which is characterized by douglas fur and western hemlock forests, the Canadian Zone which is characterized by a gradual change of vegetation from 1500 ft to 3500 ft, the Hudson Zone which is characterized by mountain hemlock, subalpine fir, and white-barked pine, the Arctic-alpine Zone which is characterized by luetkea, huckleberry, Labrador tea, and a plethora of showy wildflowers, and the Arid Transition Zone which is characterized by Oregon grape, snowberry, wild currants, and sagebrush
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