You are presented with the question "How do mammals generate heat?" and the following answer choices: 
- freezing
 - Ice cubes
 - layers of fat
 - Taking pictures
 - with their fur
 - energy of moving objects
 - Consuming calories
 - Movement of an air mass

Now knowing that mammals generate heat mainly by keeping their metabolic rate high and faster metabolism means more calories consumed, and usually, weight loss, choose the best answer.


 

       Consuming calories  