Question

multiple choice question
sharks, skates, and rays are jawed fishes with skeletons composed of
bone.
cellulose.
chitin.
cartilage.

Explanation:

Sharks, skates, and rays belong to the class Chondrichthyes. The key characteristic of Chondrichthyes is that their skeletons are made of cartilage. Bone is typical of Osteichthyes (bony fish). Cellulose is a component of plant cell walls. Chitin is found in the exoskeletons of arthropods.

Answer:

cartilage.