You are presented with the question "A response to what occurs when many muscles contract a little at once?" and the following answer choices: 
- heat
 - cold
 - sweat
 - pain
 - forces
 - stress
 - comfort
 - motion

Now knowing that shivering occurs when many muscles contract a little bit all at once and another response to cold is shivering, choose the best answer.


 

  cold       