Alright, so because a Shark is an animal it's Kingdom- Anamalia. Because it has a basic skeletal structure (Cartalidge, not bone) it goes into phylum chordata. Although, instead of being placed into the class mammalia like an elephant would, it is placed into the class chondricthyes, which is one of three classes of fish (The other two being Ostychthyes [Bony Fish] and Agnatha [Jawless fish]) that contains sharks and rays. It belongs here instead of mammalia because it's a fish, it lays eggs, has no fur, does not produce milk, etc. Look up what makes a mammal and you can compare them.
Shark is to fish dolphin is to mammal.
shark,tiger
The Hammerhead shark is not a mammal.
it is not a mammal
No It is not a mammal It's a fish
A shark is a fish
No, the sand shark is a fish with gills.
No, they are fish.
mammal
yes
yes
No