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Long before the rise of the great whites and hammerheads we know today, sharks and their cartilaginous relatives ruled Earth’s oceans and rivers in astonishing variety. It was the golden age of sharks.

But why did sharks get so incredibly diverse and odd during this period, only to lose most of that diversity forever?

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References:
https://docs.google.com/document/d/1Ib7vLFWMjMZJhfxgUljCwhti5OIH3TAp-AL4vyIGm0g/edit?usp=sharing