NEET BIOLOGY

Detailed explanation-1: -A lot of vertebrates (an animal that possesses a backbone or a spinal column) like mammals, reptiles, amphibians, birds, and fishes have an endoskeleton that is composed of tissues in the form of bones and cartilages.

Detailed explanation-2: -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-3: -Mammals, reptiles, birds, fish and amphibians are vertebrates with endoskeletons (skeletons inside their bodies). Their skeletons provide support and protection and help them to move.

Detailed explanation-4: -In three phyla and one subclass of animals, endoskeletons of various complexity are found: Chordata, Echinodermata, Porifera, and Coleoidea.

Detailed explanation-5: -The cartilaginous fish’s endoskeleton is composed of cartilage. The bony fish’s endoskeleton is mainly of bones. Cartilaginous fish come under the class Chondrichthyes and all bony fish under the class Osteichthyes.