McqMate
| Q. |
Which of the following vertebrates lack exoskeleton? |
| A. | Amphibia |
| B. | Mammalia |
| C. | Avis |
| D. | Chondrichthyes |
| Answer» D. Chondrichthyes | |
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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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