C. Chondrichthyes includes fishes with cartilaginous endoskeletons. 1. The Chondrichthyes have skeletons composed entirely of

Question

C. Chondrichthyes includes fishes with cartilaginous endoskeletons.
1. The Chondrichthyes have skeletons composed entirely of ......... which is much lighter than bone.
2. Most living chondrichthyans are grouped in the Elasmobranchii, which include the skates, rays, and sharks; nearly all are marine predators. Skates and rays are dorso-ventrally flattened, and some have electric organs that stun prey.

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