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What Did Sharks Look Like 450 Million Years Ago?

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 Archeology / Paleontology   |   Biology   |   Environmental   |   Science
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Sharks have survived through 5 mass extinctions! Find out how they've evolved throughout millions of years.
How Can We Stop Sharks From Going Extinct? - http://bit.ly/25BYSU6
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Read More:

Spiral-toothed fossil mystery solved
http://www.bbc.co.uk/nature/21589719
"US researchers used CT scans to build a computer model of what Helicoprion looked like and how it ate. They were also able to resolve a continuing puzzle over whether the unique saw-like spirals were located inside or outside the mouth. The findings show the animals were more closely related to modern chimaeras, or ratfish, than sharks."

Great White Shark Evolution Debate
https://www.sciencedaily.com/releases/2005/05/050502144430.htm
"A significant debate is currently underway in the scientific community over the evolution of the Great White shark, and Chuck Ciampaglio, Ph.D., an assistant professor of geology at the Wright State University Lake Campus, is right in the middle of it. The issue is if the Great White, one of the most feared predators of the sea, evolved from the huge prehistoric megladon shark or if its ancestry rests with the mako shark."

Sharks Have Different Personalities Just Like Humans: Study
http://www.techtimes.com/articles/161367/20160527/sharks-have-different-personalities-just-like-humans-study-au.htm
"In a study featured in the Journal of Fish Biology, scientists from Macquarie University in Sydney, Australia discovered that Port Jackson sharks have shown evidence of being shy, while others seem a bit more risk-taking than the rest of their kind. Some sharks are even less able to handle stress than others."
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