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Stingrays are considered fish, they belong to the family of the sharks.
Neither. It is a cartilaginous fish.
It's a fish - closely related to the Shark family.
A sea otter is a mammal, so it has lungs.
It is a mammal.
A mammal :)
snake
wolf
Yes.
Yes, it is.
Yes, an elephant is a mammal. They are in the Elephantidae family and are considered to be some of the largest mammals to exist.
Plants are not considered to be mammals.