Is the shark a fish or a mammal?

Sharks are not mammals as they do not possess any of the characteristic features that define a mammal. For instance, they are not warm-blooded. Sharks are considered a species of fish, but unlike most fishes, a sharks’ skeleton is made of cartilage. 

Sharks are carnivores and they feed on other smaller fish. However, sharks are opportunistic feeders and will feed on anything it can kill.

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