The human body form of a coral is called a ‘polyp’. Polyps are tubular, with tentacles as well as a mouth at just one close. The coral secretes a tough material referred to as calcium carbonate for a protecting exoskeleton. Coral reefs are formed by the exoskeletons of coral colonies. https://franciscoplgzs.thebindingwiki.com/8346780/the_basic_principles_of_animal_xxx