Section: Science

The polar bear's dense fur and an exceptionally thick layer of fat under its skin protect it against the freezing temperatures of the habitat.

How is natural selection in the evolution of a thick coat of fur in polar bears best explained?


Natural Selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution. In this case, polar bears with thicker fur were able to better survive in their environment while thinner furred polar bears died off over time.