How much do you really know about sharks? Why are they important to the ocean’s ecosystem? And are sharks really in danger of extinction? The answer to all of these questions and more can be answered using the resources below. While not much is known about ancient sharks, experts believe sharks have been around for at least 400 millions years. Sharks are fascinating creatures with over 500 species of sharks swimming in our oceans today according to Smithsonian Ocean. The 30th Anniversary of Shark Week kicks off Sunday, Jon the Discovery Channel.
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