The world's largest bear and a major predator of the Arctic, polar bear is a powerful symbol of Arctic strength and endurance. The Latin name for the polar bear, Ursus maritimus, means "sea bear". This is an apt name for this majestic species, which spends most of its life in, around, or in the oceans—especially on sea ice. In the United States, Alaska is home to two subpopulations of polar bears. Considered gifted swimmers, polar bears can maintain a speed of six miles per hour by pedaling with their forelegs and holding their hind legs flat like a wheel. They have a thick layer of body fat and a water-repellent coat that protects them from cold air and water. Polar bears spend more than 50% of their time hunting for food. A polar bear may only catch one or two of the 10 seals it hunts, depending on the time of year and other variables. Their diet consists mainly of ringed and bearded seals as they need large amounts of fat to survive. Polar bears rely heavily on sea ice for travel, hunting, resting, mating and, in some areas, brood nests. But because of the continued and potential loss of their sea ice habitat due to climate change—a major threat to polar bears—polar bears throughout the Arctic are listed as a threatened species in the US under the Endangered Species Act in May 2008. As a marine animal their habitat ice recedes earlier in the spring and forms later in the fall, polar bears are increasingly spending longer periods of time on land, where they are often attracted to areas where humans live. based on the text above identify give an example 2 clauses adverb 2 clauses adjective 2 clause noun