You are presented with the question "What has a positive impact on an animal's survival?" and the following answer choices: 
- four limbs
 - sensory neurons
 - low water availability
 - fur and fat
 - loss of food
 - heat energy
 - hormones
 - destruction of habitat

Now knowing that staying warm has a positive impact on an animal 's survival and with a thick fur coat and 4 inches of fat a bear stays warm, choose the best answer.


 

    fur and fat     