Give an illustrated account of integument and its derivatives in vertebrates with suitable diagrams. (UPSC 2024, 20 Marks, )

कशेरुकी जीवों में त्वचा और इसके व्युत्पन्नों का चित्र सहित वर्णन करें, उपयुक्त आरेखों के साथ। (Give an illustrated account of integument and its derivatives in vertebrates with suitable diagrams.)