Evolution of the shark

                    

                            sharks date back  450-420 million years before land and plants all shark came from the type of shark called megalodon and the shark megalodon was 67 feet long and still lives to this day and eats whales and other sharks . sharks grow 10 to 1000 teeth over a life time modern sharks look and think more different thain the sharks of the past.

cladoselache shark only found in the devonian period 370 million yaers ago a fast swimmers and at a size of 6 feet long 

teeth of the cladoselache shark 

 Helicoprion shark

 (Dmitri Bogdanov)