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.) (UPSC 2024,20 Marks,)

Give an illustrated account of integument and its derivatives in vertebrates with suitable diagrams.