Date: September 17, 2013.
Source: Dinosaurs About.com
Website: http://dinosaurs.about.com/od/otherprehistoriclife/a/prehistoric-sharks.htm
Source: Dinosaurs About.com
Website: http://dinosaurs.about.com/od/otherprehistoriclife/a/prehistoric-sharks.htm
--The story of PREHISTORIC SHARKS--
If I went back in time and looked at the first, unremarkable prehistoric sharks of the Ordovician period,about 420 million years ago,I might never guess that their descendants would become such dominant creatures, holding their own against vicious aquatic reptiles like pilosaurs and mosasasaurs and going on to become the "apex predators" of the world's oceans. Today, few creatures in the world inspire as much fear as the Great White Shark, the closest nature has come to a pure killing machine.
Ptychodus, an early genus in the line of shark evolution.
About the First Sharks. Well i have been research about how the first sharks look like but unfortunately i can't the real evidence beside bunch of fossilized scales. But the first sharks are believed to evolved during tnhe Ordovician period, about 420 million years ago but when I search about it said the first tetrapod didn't crawl up out the sea until 400 million years ago. Here is a timeline.
There is alot about the shark evolution I did not mention yet. About this article, I chose this article about Shark because by the time i saw the show on National geographic called "Shark Week". The show tells alot cool stuff and information about shark and about stuff i wrote on this article. The interesting thing about this is how the people started researching about Prehistoric Sharks by looking at its teeth and by finding evidence you can see how the water level of the sea changed because there is shark or fish fossils on the ground.
What significant about this article? For me this tell me alot more not just about Sharks or its evolution. What if it because of the climate change that made sharks evolve? Or how the sea level and when lands start to appear that made it evolve.