Exoskeleton is not found in

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(B) An exoskeleton is a rigid external covering for the body in some invertebrate animals,providing both support and protection.In vertebrates,the ter

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Frog

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(B) An exoskeleton is a rigid external covering for the body in some invertebrate animals,providing both support and protection.In vertebrates,the term refers to structures like scales,feathers,hair,nails,or claws.$A$. Shark: Possesses placoid scales (dermal denticles),which are considered an exoskeleton.$B$. Frog: Amphibians like frogs have moist,glandular skin without scales or other hard external structures,thus lacking an exoskeleton.$C$. Bat: Being a mammal,it possesses hair,which is an epidermal derivative and part of the exoskeleton.$D$. Mammals: Generally possess hair,nails,or claws,which are considered part of the exoskeleton.Therefore,the correct answer is $B$ (Frog).

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