What is the term for vertebrates who have a skeleton made of cartilage?
a. Osteichthyes
b. Chondrichthyes
c. Reptilia
d. Ophiuroids
ANS: B
Chondrichthyes include sharks, rays, skates, and chimaeras. Cartilage is tough and elastic, but is not
true bone. Information can be found in the section Fishes Are Earth's Most Abundant and Successful
Vertebrates.
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