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This black coral is more than 4,200 years old. Named for the color of their skeletons, black corals come in many colors.
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How old is black coral?

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An Illustration of small tentacled fossils.
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Ancient Entoproct Community

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Jellies in the Class Hydrozoa are transparent and easily overlooked.
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Transparent sea jelly

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This scientific illustration of a giant squid shows off its two long tentacle and its 8 shorter arms.
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Deep-sea Giant Squid

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a colorful sea urchin with red and white striped spikes
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Dazzling New Sea Urchin Species

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Like other cephalopods, the common cuttlefish (Sepia officials Linnaeus, 1758) possesses serious brain power.
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Common cuttlefish

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A decomposing sea star loses its grip on a rock.
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A Starfish Wasting Away

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a squid
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Meet the Only Squid that Willfully Lops off its Arms

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Bubbles of methane gas rise through a mussel bed in the Gulf of Mexico.
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Methane Bubbles Up From Seep

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Sea star in a tide pool
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Tide Pools and Adaptations

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Two thorny seahorses sit back to back underwater.
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Seahorse Lovebirds

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Big Red Deep Sea Jellyfish
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Big Red Jellyfish

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