You are presented with the question "What occurs when many muscles contract a little bit all at once?" and the following answer choices: 
- the production of cells
 - preventing heat transfer
 - To keep their body heat.
 - the production of heat
 - Generating heat
 - recovery time from fatigue
 - the production of cold
 - the production of skin

Now knowing that shivering occurs when many muscles contract a little bit all at once and involuntary contractions, shivering, cause the production of heat, choose the best answer.


 

    the production of heat     