Q: Fact 1: Mammals generate heat mainly by keeping their metabolic rate high. Fact 2: Faster metabolism means more calories consumed, and usually, weight loss. Given the two facts above, how do mammals generate heat?

Available choices:
[a]. freezing;
[b]. Ice cubes;
[c]. layers of fat;
[d]. Taking pictures;
[e]. with their fur;
[f]. energy of moving objects;
[g]. Consuming calories;
[h]. Movement of an air mass;
The answer is:
[g].