Origin of the species
Initially it was assumed that the polar bear separated from brown about 45-150 thousand years ago, probably in the territory of modern Ireland. However , a recent study showed that the polar bear separated from their common ancestor with brown bear 338-934 thousand years ago ( an average of 600 thousand years ago) , and 100-120 thousand years ago by crossing species representatives took their hybridization , resulting in all modern polar bears are descended from these hybrids .Appearance
Head bears. From left to right : Brown , Black, White .Polar bear - one of the largest terrestrial carnivorous mammals of Representatives . Its length is 3 m , weight up to 1 ton Usually males weigh 400-450 kg , body length of 200-250 cm, height at the withers 130-150 cm Females noticeably smaller ( 200-300 kg). The smallest bears are found on Spitsbergen , the largest - in the Bering Sea .Polar bear from other bears distinguish long neck and flat head . His skin is black. Fur color varies from white to yellowish ; summer fur may turn yellow due to constant exposure to sunlight . Polar bear fur is devoid of pigment stains, and hollow hairs . Translucent hairs allows only ultraviolet rays, giving the coat insulating properties . When ultraviolet photography polar bear seems dark . Due to the structure of the polar bear hairs can sometimes " go green ." It happens in a hot climate ( in zoos ) , when inside hairs infest microscopic algae .<span>Soles of the feet are hit wool, not to slip on the ice and not freeze. Between the fingers has a flipper and the front paws trimmed stiff bristles. Large claws can keep even a strong prey.</span>
<span>adj: central,
hot , deep , cold, national , high , scientific , fresh, foreign ,</span>
<span>noun: butcher,
arrival, check in (как регистрация), scientist , electricity , science
, nationality , exploration, fare </span><span><span /></span>
<span><span> verb: separate , rise , explore , kill , arrive
, continue , check in (</span>как регистрироваться)</span>
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Наука-изобретение чего то нового.Это величайшие открытия всем известных людей.Наука- это учёба и знания.Без науки жизнь стояла бы на одном месте и не двигалась бы вперёд.