Choose your answer from:
I. coat;
II. wool;
III. energy;
IV. nektar;
V. warm;
VI. cold;
VII. shivering;
VIII. hydrated;
Given those answer options, answer the question: Fact 1: Mammals conserve body heat with their hair or fur. Fact 2: Birds waste a lot of body heat trying to keep warm in exposed areas. Given the two facts above, mammals keep what with hair or fur?
A:
V.