Which class of animals lacks an exoskeleton?

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(B) The class $Chondrichthyes$ (cartilaginous fishes) consists of animals that lack an exoskeleton. Their skin is covered with placoid scales,which ar

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Chondrichthyes

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(B) The class $Chondrichthyes$ (cartilaginous fishes) consists of animals that lack an exoskeleton. Their skin is covered with placoid scales,which are dermal in origin and not considered a true exoskeleton like the scales found in $Reptilia$ or the feathers in $Aves$. $Amphibia$ also generally lack an exoskeleton,but $Chondrichthyes$ is the classic example in this context regarding the absence of a protective external covering like scales or feathers.

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