Coral sea creatures in anthozoa (Anthozoa) exist in the form of small polyp may look like anemones form the populations consist of many identical individuals. This individuals secrete calcium carbonate to form hard skeleton, build up the coral reefs in the tropical waters.An actual coral head is made from thousands of individuals has an identical gene, each polyp only seem to be a few millimetres. After thousands of generations, the polyp left a skeletal frame is featured on our species. Each coral head grows thanks to the asexual reproduction of the polyp. Coral also sexual reproduction by gametes, is released simultaneously in a period from one to several nights in a row during the full moon.Although corals can use the magnet (nematocyst) secretion of toxins in the tentacles to catch plankton, this type of animal collectors most nutrients from symbiotic algae called Golden algae, unicellular (zooxanthella). Therefore, most corals depend on sunlight and grow in the shallow waters, often at a depth inaccessible to 60 m (200 ft). Coral can contribute to the physical structure of the coral reefs grow in tropical waters or areas, such as the Great Barrier Reef off Queensland, Australia. Other corals do not need to go to algae and can live in deeper waters, such as the species Lophelia water-conditioning is to a depth of 3,000 m in the Atlantic. [3] An example is Darwin Mounds in southwestern Cape Wrath, Scotland. Coral is also found off the coast of Washington State and the Aleutian Islands in Alaska, United States of America.
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