There are a lot of different biomes, many places like the tundra which is very cold all year, and the animals there need a lot of fur to keep them warm. So if a polar bear was moved from the artic to the dessert, it would die, because the climate can not support the polar bear. Every biome is designed to support a certain type of animal, and the animal has to adapt to the environment. An example is humans. Humans have lived for thousand of years, and we have adapted to the changes in climate over the years, like some animals.