(C) The exoskeleton of a cockroach is hard and is composed of a tough,non-living substance called $Chitin$.This exoskeleton provides protection to the

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(C) The exoskeleton of a cockroach is hard and is composed of a tough,non-living substance called $Chitin$.This exoskeleton provides protection to the internal organs and serves as a site for muscle attachment.It is secreted by the underlying epidermis and is organized into plates called sclerites.