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![A cluster of two species of deep-sea coral skeletons grown together: the thinbranched top is likely Solenosmilia while the circular bottom cups areDesmophyllum expl8381.jpg A cluster of two species of deep-sea coral skeletons grown together: the thinbranched top is likely Solenosmilia while the circular bottom cups areDesmophyllum](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_expl8381.jpg?itok=0h_Wv3_s)
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A cluster of two species of deep-sea coral skeletons grown together: the thinbranched top is likely Solenosmilia while the circular bottom cups areDesmophyllum. The dark green dead skeletons can support live coral (white), and provide scientists a timeline of growth that can span decades. (Image credit: Deepwater Canyons 2013 -Pathways to the Abyss, NOAA-OER/BOEM/USGS)