What is the material that forms the hard outside of insects such as cockroaches?
The cockroach's shell is made of chitin, a complex polysacharide that is also found in the shells of crabs, and lobsters. Artificial chitin is also achieved by human. th
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The body covering of an insect is called an exoskeleton. Meaning that their skeleton is external or on the outside. As they grow insects shed their old exoskeleton when a new one forms. The new exoskeleton however is softer and at this time the insect is most vulnerable, that is until the new one hardens.