All of the following are true of hard corals except:
◦ corals have a motile planula larval form.
◦ corals are members of the Kingdom Animalia, Phylum Cnidaria, Class Anthozoa.
◦ corals grow in shallow water with high light and relatively low organic nutrient input.
◦ coral distribution worldwide is limited to areas where the water temperature exceeds 25ºC.
◦ corals have obligate endosymbionts.