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.
This bear swam continuously for 232 hours and 687 km and through waters that were 2-6 degrees C, says research zoologist George M. Durner. We are in awe that an animal that spends most of its time on the surface of sea ice could swim constantly for so long in water so cold.