Which of the following vertebrates lack exoskeleton? (1) Amphibia (2) Mammalia (3) Avis (4) Chondrichthyes

Which of the following vertebrates lack exoskeleton? (1) Amphibia (2) Mammalia (3) Avis (4) Chondrichthyes
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(4) Chondrichthyes Explanation: An exoskeleton is the external skeletons that supports and protects an animal's body, in contrast to the internal skeleton (endoskeleton) of, for example, a human. Chondrichthyes or cartilaginous fishes are jawed fish with paired fins, paired nares, scales, a heart with its chambers in series, and skeletons made of cartilage rather than bone.
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