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Virtually unchanged in the past 90 million years
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first true “modern” sharks
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They quickly became a dominant force in the oceans worldwide and continue
to live today
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These sharks developed a wide variety of teeth and replaced them at rate
which was previously unparalleled
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What made them “modern”...
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Vetebral centra calcified
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More flexible fins
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Reduced spines
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***Ventrally positioned mouth***
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Maneuverable upper jaw resulting in stronger and larger bites (Fenton and
Fenton)
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