Question 8
Birds and mammals carry a layer of fat beneath the skin. What does it do for them?
The right answer is the one marked above.
The subcutaneous fat layer acts as a heat insulator, which helps these animals hold their body temperature steady.
Birds and mammals are warm-blooded — their body temperature does not follow the surroundings — so keeping heat in is a job that has to be done. Fat around the internal organs does something different: it absorbs shocks from outside and protects them.