There are different names because it depends on their shape and kind of techniques and not all of them do the same thing
because there are so many different variations of scientific names.
There are around 440 different species of sharks in the world (great white sharks, carpet sharks, hammerheads, whale sharks, tiger sharks, blue sharks, mako sharks, lemon sharks, angel sharks, thresher sharks, megamouth sharks, zebra sharks, nurse sharks, basking sharks, and bull sharks, just to name a few). And they all grow to different sizes. So, unless you specify what kind of shark(s) you're talking about, this question is far too general to be answered. See the Related Link below for the Wikipedia entry for sharks.
Because they keep on breeding!
Aarani is one of the many names give Goddess Durga.As the goddess has so many different names people do not realize that they are named after a god.
Dolphins are not friendly with sharks, and in fact have saved humans from sharks in many documented cases.
There are approximately about 1,00,000 to 2,00,000 whale sharks left in the wild.
Birds, snakes, reptiles, amphibians, elephants.
There is no definite answer, since sharks are always repopulate as humans. So since they keep making more, there is no answer to how many there are now
It's always different, but most sharks usually have hundreds of either tiny or huge teeth. *Fun Fact* Did you know sharks have rows of teeth, so when they loose one, another one moves back in it's place, usually bigger than the old one!
nobody knows, there are different types of sharks so be more specific
The oceans have different names so people can refer to the different parts by name. It is the same concept as to why your body has different parts that have different names. Hope this helps! :)
I am sorry but there are so many and it would be hard to name them all.