Staying warm has a positive impact on an animal 's survival.
With a thick fur coat and 4 inches of fat a bear stays warm.
Fur and fat has a positive impact on an animal's survival.
What has a positive impact on an animal's survival?

a: four limbs
b: sensory neurons
c: low water availability
d: fur and fat
e: loss of food
f: heat energy
g: hormones
h: destruction of habitat