Sharks (Superorder Selachimorpha) are a type of fish with a full cartilaginous skeleton and a highly streamlined body.
Sharks are found in all seas and are common down to depths of 2,000 meters (6,600 ft). They generally do not live in freshwater, with a few exceptions such as the bull shark and the river shark which can live both in seawater and freshwater. They breathe through five to seven gill slits.
Whale is a group of mammals that live in the ocean. The title "whale" was given to the member nations that are large cetaceans. The whale is not classified in the family fish. The whale has the following characteristics:
- Breathe using lungs
- Have hair
- Warm-blooded
- Have mammary glands
- Have a heart with four chambers
