yes
One, white.
Colours do not describe anything
Polar bears are found in the North Pole. If one wanted to see interesting pictures of Polar bears, one can go to The Amazing Image, Polar Bears International, National Geographic and NWF to find good photographs.
sure they can
See Polar Bears
they have black or brown
Cats and bears are very different. A polar bear and a cheetah are different colors and different sizes. A cheetah runs much faster than a polar bear.
Melting sea ice is a threat to the polar bears because without the sea ice the polar bears predators will see them and swim away.
For a slew of reliable information about polar bears, see Answers.com via the Related link.
Not all whales, but Killer Whales can, and have eaten Polar Bears. Polar Bears are one of the many animals that Killer Whales eat. See related links below for others.
By visiting to see them at locals zoos, and showing support for them by supporting wild-life reservations which support polar bears.
white and when born in light pink but that's all i know