If preventing the transfer of heat from a human's body causes that human to keep warm, then how does a human keep warm?

Answer choices:
- Something with a head, thorax, and abdomen
 - drinking plenty of water
 - increases the transfer of heat
 - transfers heat to someone
 - heat is produced
 - hard outer covering
 - prevents the transfer of heat
 - they body they live in

 

       prevents the transfer of heat   