Fossil records indicate that ancestors of modern sharks swam the seas over 400 million years ago, making them older than dinosaurs! Throughout time sharks have changed very little.
http://www.flmnh.ufl.edu/fish/education/questions/Basic...
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Sharks question: How long have sharks existed? Over 400 million years! ... How long have shark existed? How long has sharks been here? Since when have sharks existed? For how long has sharkes existed?
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wiki.answers.com/Q/How_long_have_sharks_existed
wiki.answers.com/Q/How_long_have_sharks_existed
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1. How many species of sharks are there? 2. Why do sharks attack humans? 3. What are sharks natural prey? 4. What is the largest shark? 5. How long have sharks existed? 6. In which parts of the world do you find sharks?
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www.field-trips.org/sci/sharks/index.htm
www.field-trips.org/sci/sharks/index.htm
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Fossil records indicate that ancestors of modern sharks swam the seas over 400 million years ago, making them older than dinosaurs! They are considered to be the first vertebrate with a complete jaw. Throughout time sharks have changed very...
http://pelangis.blogspot.com/2008/04/tuesday.html
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Sharks have been around a long time - longer than dinosaurs. Fossil evidence shows sharks (relatives of today's sharks) existed 400 million years ago. The shark families that exist today were around at least 100 million years ago.
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www.whaletimes.org/sharks.htm
www.whaletimes.org/sharks.htm
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How long have sharks existed? ... 2.Types of sharks-How many are there? Which ones are considered the most dangerous? Describe a few sharks. 3.Evolution of sharks-How long have they been around and why have they survived for so long? 4.Anatomy of sharks-What are the physical characteristics of sharks?
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www.nevada.edu/~skylar/SHARKQUEST.HTML
www.nevada.edu/~skylar/SHARKQUEST.HTML
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Free Online Library: The first monsters: long before sharks, Anomalocaris ruled the seas. (oldest known large predators) by "Science News"; Science and technology, general Cambrian period Paleontology ... ancestors got their start during this long-past era. ... The first shark: to bite or not to bite? (first sharks,
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www.thefreelibrary.com/The+first+monsters%3A+long+befor...
www.thefreelibrary.com/The+first+monsters%3A+long+before+sharks%2C+Anomalocaris+ruled+the+seas-a015811436
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The days of everyone leaving with one or more megalodon were long over, but, as I recall, about 10 or 12 left that ... Subsequent research of marine currents concluded that a strong thermocline existed within this oceanic embayment during the Lower Miocene, ... SHARKS. Aurora can provide the collector with shark teeth (vertebrae,
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www.elasmo.com/leecreek/leecreek.html
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Whales question: How long have whale sharks existed? since right after a sharks came into being ... Discuss the question "How long have whale sharks existed?"
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wiki.answers.com/Q/How_long_have_whale_sharks_existed
wiki.answers.com/Q/How_long_have_whale_sharks_existed
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