The Ocean Through Time

Life began in the ocean around 3.5 billion years ago and as evolution progressed, many species went extinct -- and some left behind fossils -- as others appeared. And even now, the ocean hasn't stopped changing as evolution continues and humans leave their mark.

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For the last 150 years, paleontologists have debated the origins of the great white shark . Many believe that they descended from the 50-foot megalodon, also known as the megatooth shark ( Carcharocles megalodon...
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Microscopic, single-celled organisms called foraminifera have a fossil record...
CREDIT: Smithsonian Arctic Studies Center Basque Whalers Background Having...
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When you're standing in a museum surrounded by fossils, you can almost imagine...

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