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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What makes a top predator? Razor-sharp teeth? Speed? Strength? Size? Who is the most fearsome hunter? It depends on where and when you look.
The ocean is not as natural as it once was. Where there used to be large...
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Evidence shows that life probably began in the ocean at least 3.5 billion years...
A public service announcement uses a dramatic example to emphasize that ocean...

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