12 MEDICAL DEVICE REGULATIONS In Canada, devices of classes III and IV are subject to in-depth regulatory scrutiny,while class II devices require only the manufacturerâs declaration of device safety andeffectiveness before sale.
No problem: Polar bears in the study were seen swimming distances of 90 miles without any problems - and some bears went a lot further Scientists discovered that during the summer months, when sea ice is at its minimum, the bears were swimming farther and for longer periods of time than ever before in search of new hunting grounds.
Polar bears were once thought to be aimless wanderers, but scientists now believe that, like other members of the bear family, many of them have distinct territories, or home ranges. After leaving their mothers, young polar bears may travel more than 1,000 kilometers / 600 miles to establish their own territory. It appears that the size of a polar bear's range is determined by the amount of available food. Bears living in areas with an abundance of ice and seals have smaller home ranges. A satellite-tracked polar bear surprised researchers with a 3,000 mile / 4,800 km trek.