Wings are part of the exoskeleton and attached to the thorax, and behind the head is the thorax. Given these facts, wings are part of the exoskeleton and attached where among the following options:
- insects
 - Earth orbiting the Sun
 - h2o
 - layers of fat
 - an organism's body
 - tail
 - objects that have mass
 - behind the head


 

        behind the head 