I think sharks are amazing creatures.  How do you feel about them?
Modern sharks are known as clade Selachimorpha.
That's cool - what were non-modern sharks known as?
Sharks are a bunch of fish characterized by cartilaginous skeleton.
And they bite.....what do they eat?
"Shark" has also been used for extinct members of a subclass.
And, what do they eat?
They usually don't live in freshwater.
So, then, where do they live?
Sharks are found in all seas.