DENDROLOGY

Detailed explanation-1: -Sharks are fish. They live in water, and use their gills to filter oxygen from the water. Sharks are a special type of fish known because their body is made out of cartilage instead of bones like other fish.

Detailed explanation-2: -Unlike whales, sharks are not mammals but belong to a group of cartilaginous fishes. The whale shark (Rhincodon typus) earns the name “whale” solely because of its size.

Detailed explanation-3: -Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven-gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha and are the sister group to the rays.