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In the northernmost areas, plants are at their metabolic limits, and small differences in the total amount of summer warmth make large differences in the amount of energy available for maintenance, growth and reproduction.Colder summer temperatures cause the size, abundance, productivity and variety of plants to decrease.

Its precipitation mostly comes in the form of snow and is low, with most of the area receiving less than 50 cm (20 in).

High winds often stir up snow, creating the illusion of continuous snowfall.

There are a number of definitions of what area is contained within the Arctic.

The area can be defined as north of the Arctic Circle (66° 33'N), the approximate southern limit of the midnight sun and the polar night.

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Even if you choose not to have your activity tracked by third parties for advertising services, you will still see non-personalized ads on our site.In recent years, Arctic sea ice decline has been caused by global warming.The name refers either to the constellation Ursa Major, the "Great Bear", which is prominent in the northern portion of the celestial sphere, or to the constellation Ursa Minor, the "Little Bear", which contains Polaris, the Pole star, also known as the North Star.The polar bear is also a predator, though it prefers to hunt for marine life from the ice.There are also many birds and marine species endemic to the colder regions.Perhaps the most alarming result of this is arctic sea ice shrinkage.

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