Endo skeleton is made up of bones which are hard and strong. So they can support the organism in every field, While exoskeleton is made up of chitin, which is a thin and soft material and can't support heavy bodies. Correct Answer Endo skeleton is made up of bones which are hard and strong. So they can support the organism in every field, While exoskeleton is made up of chitin, which is a thin and soft material and can't support heavy bodies.