(D) Both snakes and lizards belong to the class $Reptilia$. These animals possess an exoskeleton of keratinized scales or scutes. As they grow,they pe

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(D) Both snakes and lizards belong to the class $Reptilia$. These animals possess an exoskeleton of keratinized scales or scutes. As they grow,they periodically shed their outer layer of skin,a process known as ecdysis or molting,which is often observed as a 'skin cast'.