Fact 1: Mammals can also generate little bursts of heat by shivering.

Fact 2: Heat is produced by muscle action and shivering.

Given the two facts above, answer the question "How can you generate heat?" with the following options: 
- With your hair
 - Electrical energy
 - Fully cooking the oysters
 - Raise your blood glucose
 - With your muscles
 - flow of electrons
 - Raise your oxygen level
 - Movement of an air mass


 

     With your muscles    