Question

What is the odd one out whale seal dolphin shark? What others are ?

Answer 1

Answer:

Shark is the odd one out because it is a fish beonging to cartilginous fishes.

Whale, seal and dolphin are mammals.

Explanation:

Answer 2

Shark is the odd one out  because it is the only cartilaginous fish.

Explanation:

• Shark is a marine animal belonging to elasmobranch, which is a group of species like the shark, ray fish, and skates, are fishes with skeleton made up of cartilaginous tissues and connective tissues.
• Although the cartilage tissue of sharks are durable, flexible and provides a supportive framework, it’s density is less compared to hard bones.
• This factor helps it to maintain a lightweight body which helps them to swim with great flexibility.  
• Whales and dolphins are marine mammals belonging to Cetacea and have a skeletal system comprised of hard bones.
• Seals are Pinnipeds which are marine but semi-aquatic animals have a skeletal system complete with skull, neck and trunk bones.