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Not only did sharks first appear 400 million yeas ago, they are still here today. They have survived 5 massive planet extinction events. These extinction events killed most life on earth. The last one around 65 million yeas ago killed the dinosaurs. But not sharks. They were here to stay
 
the word “shark” may conjure up images of great whites and hammerheads, there are at least 500 shark species (perhaps even more) roaming the world’s oceans today. They vary in size and even shape, but they all tend to share similar body characteristics like large livers, flexible cartilaginous skeletons and enhanced sensory systems
 
Shark teeth are popular and often inexpensive beach souvenirs. Sharks shed their teeth constantly, and once one falls to the ocean floor, it’s quickly covered with sand. It soaks up sediments like silica and calcite, which change the tooth’s color from white to gray or brown
 
Thousands of people enter the ocean on a daily basis for either swimming, diving, snorkeling, boating among many other activities. Maybe even in places where there are sharks all the time! Yet only an average of 30 to 50 shark attacks is reported each year. Only 5 to 10 prove to be fatal. This proves that shark do not eat people. If they did, there would be hundreds of people dying every month – which does not happen
 
While many people fear sharks and think of them as one of the world’s most aggressive and deadly animals, the chances of dying from a shark attack fall well below the chances of being killed by hornets, wasps, bees or dogs
 
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