ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Gersemia fruticosa soft coral, with its polyps out and feeding. Corals are small colonial invertebrate animals. Individual polyps may join together to make large structures, which are the basis of coral reefs. The main types are hard and soft corals. Soft corals differ from hard corals in that there is no hard calcium mineral skeleton laid down.
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