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A brittle star clings to the branches of a deep sea coral
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Brittle Star Coral Mutualism

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A fan-shaped colony of red coral (Corallium sp.) provides a perch for three basket stars as they feed.
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Red Coral

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The pink strands of this coral harbor a variety of organisms. Sea whips are gorgonian corals, with flexible skeletons.
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Sea Whip Coral

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Flower-like clusters of pink polyps make up this coral colony.
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Coral Colony

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Algas que crecen en rocas submarinas.
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Los Héroes de los Herbívoros

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Dr. J. Murray Roberts photographed these living polyps from the Mingulay Reef Complex off Scotland in aquaria in 2010.
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Lophelia Pertusa Coral Polyps

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Cancer cells treated with discodermolide, a chemical from a sponge found on deep-sea coral reefs.
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Treated Cancer Cells

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Photo of coral polyp, with a single bleach polyp.
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Corals Threatened by Acid Seas

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These corals are dead—smothered in sediments and overgrown with algae.
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Dead Coral Overgrown with Algae

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Imagen submarina de dos peces nadando cerca de corales pétreos y ramificados.
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Historias de Éxito de una Boleta de Calificaciones de Reef

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Pink crustose algae covers the surface of a rock.
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Encrusting Pink Algae and a Seastar

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What is coral? The answer is coral is an animal. This cutaway diagram of a coral polyp shows the location of its photosynthetic algae, or zooxanthellae, which coral needs to survive.
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What Is Coral? A Coral Polyp and Zooxanthellae

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