If mammals have a layer of fat under the skin to help keep the body warm in a variety of climates, then mammals have a layer of fat under the skin to help keep the body warm in what?

Answer choices:
- cozy cabins
 - by keeping them warm
 - warm areas
 - a variety of climates
 - In the winter
 - heat or cold
 - the environment
 - sunny places

 

    a variety of climates      