NEET BIOLOGY

Detailed explanation-1: -The skeleton of cartilaginous fishes is made up of cartilage. Only the teeth of this species and rarely the vertebrae are calcified. Sharks, skates, chimaeras and rays make up the group of Chondrichthyes.

Detailed explanation-2: -Chondrichthyes. Chondrichthyes is a class that contains sharks, skates, rays and chimeras. They are jawed vertebrates, with skeletons made of cartilage instead of bone. The class can be divided into two subclasses; Elasmobranchii (sharks, rays, skates, and sawfish) and Holocephali (chimaeras).

Detailed explanation-3: -Cartilaginous skeleton Sharks, rays, skates, and chimaeras (also know as rat fishes) all have cartilaginous skeletons. Cartilage is less dense than bone, allowing sharks to move quickly through the water without using too much energy.

Detailed explanation-4: -Cartilaginous fish include sharks, rays and, skates. Cartilaginous fishes have a skeleton made of cartilage, a material that is lighter and more flexible than bone. These type of fishes have movable jaws that are usually armed with well developed teeth.

Detailed explanation-5: -Class-Osteichthyes Class Osteichthyes includes all bony fishes. Like all fishes, Osteichthyes are cold-blooded vertebrates that breathe through gills and use fins for swimming.