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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Evidence shows that life probably began in the ocean at least 3.5 billion years ago. Photosynthesis began more than 2.5 billion years ago—the Great Oxidation Event. But it took hundreds of millions of years...
A public service announcement uses a dramatic example to emphasize that ocean...
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Jorge and I packed up the night we arrived in Panama with Aaron O'Dea and his...
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Sirenians , or seacows, are a group of marine mammals that include manatees and...

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