OPT:
i. their blood cells;
ii. fur and fat;
iii. their nails;
iv. layers of fat;
v. Exfoliation;
vi. sweating;
vii. their fur;
viii. their hair;
Given those answer options, answer the question: Fact 1: Mammals conserve body heat with their hair or fur. Fact 2: Dogs, of course, are mammals. Given the two facts above, how do dogs conserve body heat?
A:
vii.