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This jellyfish fossil is from the Cambrian period, more than 500 million years ago.
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Fossil Jellyfish

 How long have jellyfish lived in the ocean? This jellyfish fossil is from the...
Rudist clams are mollusks that went extinct about 65 million years ago.
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Rudist Clams

 Rudist clams are mollusks that went extinct about 65 million years ago. They were...