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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The evolution of whales represents one of the great stories in macroevolution. It's a narrative that has mostly benefitted from an extraordinary series of fossils recovered from rocks around the world, including challenging field...
About 100 million years ago , during the heyday of the dinosaurs, reefs were...
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Most people have never heard of the Hawaiian petrel , an endangered, crow-sized...
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What makes a top predator? Razor-sharp teeth? Speed? Strength? Size? Who is the...

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Often it's the tiniest organisms that do the most harm. One example is microscopic algae, which can grow rapidly to form harmful algal blooms . Such...
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Whales swim, but their ancestors walked. Whales are mammals (like us) whose ancestors lived on land. Life probably began in...