Q: Fact 1: Wings are part of the exoskeleton and attached to the thorax. Fact 2: An exoskeleton is an external framework. Given the two facts above, what body part would be attached to the external framework?

Select from:
(a). heart.
(b). insects.
(c). respiratory system.
(d). wings.
(e). humans.
(f). Tail.
(g). fat.
(h). digestive system.
A:
(d).